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569 vulnerabilities by mattermost
CERTFR-2026-AVI-1479
Vulnerability from certfr_avis - Published: 2026-11-06 - Updated: 2026-11-06
De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.11.x antérieures à 11.11.4 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.15 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 12.0.x antérieures à 12.0.2 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.10.x antérieures à 11.10.5 |
References
| Title | Publication Time | Tags | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.11.x ant\u00e9rieures \u00e0 11.11.4",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.15",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 12.0.x ant\u00e9rieures \u00e0 12.0.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.5",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-11-06T00:00:00",
"last_revision_date": "2026-11-06T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1479",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-11-06T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-11-05",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00592",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-11-05",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00781",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-11-05",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00786",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1458
Vulnerability from certfr_avis - Published: 2026-11-04 - Updated: 2026-11-04
De multiples vulnérabilités ont été découvertes dans les produits Mattermost. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.12 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.11.x antérieures à 11.11.2 | ||
| Mattermost | Mattermost Desktop App | Mattermost Desktop App versions 6.x antérieures à 6.2.5 | ||
| Mattermost | Mattermost Desktop App | Mattermost Desktop App versions 6.3.x antérieures à 6.3.1 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.10.x antérieures à 11.10.3 |
References
| Title | Publication Time | Tags | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.12",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.11.x ant\u00e9rieures \u00e0 11.11.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Desktop App versions 6.x ant\u00e9rieures \u00e0 6.2.5",
"product": {
"name": "Mattermost Desktop App",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Desktop App versions 6.3.x ant\u00e9rieures \u00e0 6.3.1",
"product": {
"name": "Mattermost Desktop App",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.3",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-11-04T00:00:00",
"last_revision_date": "2026-11-04T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1458",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-11-04T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans les produits Mattermost. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans les produits Mattermost",
"vendor_advisories": [
{
"published_at": "2026-11-03",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00804",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-11-03",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00770",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-11-03",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00767",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-11-02",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00800",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1409
Vulnerability from certfr_avis - Published: 2026-10-29 - Updated: 2026-10-29
Une vulnérabilité a été découverte dans Mattermost Server. Elle permet à un attaquant de provoquer un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.9.x antérieures à 11.9.2 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.11 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.8.x antérieures à 11.8.6 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.9.x ant\u00e9rieures \u00e0 11.9.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.11",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.8.x ant\u00e9rieures \u00e0 11.8.6",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-93851",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-93851"
}
],
"initial_release_date": "2026-10-29T00:00:00",
"last_revision_date": "2026-10-29T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1409",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-29T00:00:00.000000"
}
],
"risks": [
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Mattermost Server. Elle permet \u00e0 un attaquant de provoquer un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Vuln\u00e9rabilit\u00e9 dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-28",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00742",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1388
Vulnerability from certfr_avis - Published: 2026-10-27 - Updated: 2026-10-27
Une vulnérabilité a été découverte dans Mattermost Server. Elle permet à un attaquant de provoquer un déni de service à distance.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.9.x antérieures à 11.9.2 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.11 | ||
| Mattermost | Mattermost Server | Mattermost Server versions antérieures à 11.10.0 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.8.x antérieures à 11.8.6 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.9.x ant\u00e9rieures \u00e0 11.9.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.11",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions ant\u00e9rieures \u00e0 11.10.0",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.8.x ant\u00e9rieures \u00e0 11.8.6",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2026-116516",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-116516"
}
],
"initial_release_date": "2026-10-27T00:00:00",
"last_revision_date": "2026-10-27T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1388",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-27T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Mattermost Server. Elle permet \u00e0 un attaquant de provoquer un d\u00e9ni de service \u00e0 distance.",
"title": "Vuln\u00e9rabilit\u00e9 dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-26",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00723",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1380
Vulnerability from certfr_avis - Published: 2026-10-26 - Updated: 2026-10-26
Une vulnérabilité a été découverte dans Mattermost Server. Elle permet à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.10.x antérieures à 11.10.4 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.14 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.11.x antérieures à 11.11.3 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.4",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.14",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.11.x ant\u00e9rieures \u00e0 11.11.3",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-10-26T00:00:00",
"last_revision_date": "2026-10-26T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1380",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-26T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Mattermost Server. Elle permet \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Vuln\u00e9rabilit\u00e9 dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-23",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00759",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1368
Vulnerability from certfr_avis - Published: 2026-10-23 - Updated: 2026-10-23
Une vulnérabilité a été découverte dans Mattermost Server. Elle permet à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.14 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.14",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-10-23T00:00:00",
"last_revision_date": "2026-10-23T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1368",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-23T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Mattermost Server. Elle permet \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Vuln\u00e9rabilit\u00e9 dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-22",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00708",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1348
Vulnerability from certfr_avis - Published: 2026-10-21 - Updated: 2026-10-21
De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.11.x antérieures à 11.11.2 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.13 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.10.x antérieures à 11.10.3 |
References
| Title | Publication Time | Tags | ||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.11.x ant\u00e9rieures \u00e0 11.11.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.13",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.3",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-10-21T00:00:00",
"last_revision_date": "2026-10-21T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1348",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-21T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-20",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00783",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-20",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00772",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1344
Vulnerability from certfr_avis - Published: 2026-10-20 - Updated: 2026-10-20
De multiples vulnérabilités ont été découvertes dans Mattermost Server. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.12 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.11.x antérieures à 11.11.2 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.8.x antérieures à 11.8.6 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.10.x antérieures à 11.10.3 |
References
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.12",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.11.x ant\u00e9rieures \u00e0 11.11.2",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.8.x ant\u00e9rieures \u00e0 11.8.6",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.10.x ant\u00e9rieures \u00e0 11.10.3",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-10-20T00:00:00",
"last_revision_date": "2026-10-20T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1344",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-20T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Mattermost Server. Elles permettent \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00750",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00780",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00784",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00720",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00753",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00744",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00746",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00785",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00743",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00755",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00749",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00721",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00745",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00751",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-10-19",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00740",
"url": "https://mattermost.com/security-updates/"
}
]
}
CERTFR-2026-AVI-1338
Vulnerability from certfr_avis - Published: 2026-10-19 - Updated: 2026-10-19
Une vulnérabilité a été découverte dans Mattermost Server. Elle permet à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
| Vendor | Product | Description | ||
|---|---|---|---|---|
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.12 |
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.12",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [],
"initial_release_date": "2026-10-19T00:00:00",
"last_revision_date": "2026-10-19T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-1338",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-10-19T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
}
],
"summary": "Une vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 d\u00e9couverte dans Mattermost Server. Elle permet \u00e0 un attaquant de provoquer un probl\u00e8me de s\u00e9curit\u00e9 non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur.",
"title": "Vuln\u00e9rabilit\u00e9 dans Mattermost Server",
"vendor_advisories": [
{
"published_at": "2026-10-16",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00709",
"url": "https://docs.mattermost.com/security-guide/security-updates"
}
]
}
CVE-2026-93851 (GCVE-0-2026-93851)
Vulnerability from cvelistv5 – Published: 2026-10-28 21:41 – Updated: 2026-10-30 03:56
VLAI
EPSS
VEX
Title
Path traversal in Mattermost Agents plugin mention reminder allows plugin replacement via crafted post
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to validate the target post ID in the Agents plugin's mention reminder component, which allows an authenticated user who can post in a channel visible to a system administrator to cause the administrator's browser to send an unintended API request, resulting in replacement of an installed plugin and code execution on the server, via a crafted post containing a forged mention reminder that the administrator clicks. Mattermost Advisory ID: MMSA-2026-00742
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 00:00 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Unaffected: 11.10.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 |
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"dataType": "CVE_RECORD",
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CVE-2026-93846 (GCVE-0-2026-93846)
Vulnerability from cvelistv5 – Published: 2026-10-26 15:58 – Updated: 2026-11-02 19:43
VLAI
EPSS
VEX
Title
Team admin can escalate a team member's permissions via the team member roles endpoint
Summary
Mattermost versions 11.7.x <= 11.7.10 fail to restrict which built-in roles can be assigned to a team member via the API, which allows a team admin to grant a team member permissions beyond those permitted by the configured permission scheme via the {{update-team-member-roles}} REST API.. Mattermost Advisory ID: MMSA-2026-00734
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 18:29 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.10
(semver)
Unaffected: 11.11.0 Unaffected: 11.7.11 |
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CVE-2026-93848 (GCVE-0-2026-93848)
Vulnerability from cvelistv5 – Published: 2026-10-26 14:28 – Updated: 2026-10-26 16:46
VLAI
EPSS
VEX
Title
Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator
Summary
Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:34 UTC
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.10
(semver)
Unaffected: 11.11.0 Unaffected: 11.7.11 |
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CVE-2026-93850 (GCVE-0-2026-93850)
Vulnerability from cvelistv5 – Published: 2026-10-26 14:26 – Updated: 2026-10-26 16:46
VLAI
EPSS
VEX
Title
Unbounded memory consumption during PDF text extraction
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to bind the volume of text extracted from an uploaded PDF which allows an authenticated user to exhaust server memory and cause a denial of service via a crafted PDF whose compressed content stream expands into a very large amount of text.. Mattermost Advisory ID: MMSA-2026-00769
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:32 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Affected: 11.10.0 , ≤ 11.10.1 (semver) Unaffected: 11.11.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 Unaffected: 11.10.2 |
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CVE-2026-93849 (GCVE-0-2026-93849)
Vulnerability from cvelistv5 – Published: 2026-10-26 14:25 – Updated: 2026-10-26 16:46
VLAI
EPSS
VEX
Title
Mattermost allows authenticated users to trigger excessive memory allocation via crafted msgpack binary WebSocket frames
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 Mattermost fail to apply allocation limits to the byte-string decode paths in its WebSocket msgpack decoder, which allows an authenticated remote attacker to cause excessive server memory allocation via a crafted binary WebSocket frame declaring a Bin32 payload length of up to 4,294,967,295 bytes.. Mattermost Advisory ID: MMSA-2026-00768
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 15:32 UTC
CWE
- CWE-789 - Memory Allocation with Excessive Size Value
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Affected: 11.10.0 , ≤ 11.10.1 (semver) Unaffected: 11.11.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 Unaffected: 11.10.2 |
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CVE-2026-93847 (GCVE-0-2026-93847)
Vulnerability from cvelistv5 – Published: 2026-10-26 14:15 – Updated: 2026-11-02 19:43
VLAI
EPSS
VEX
Title
Improper post type validation on scheduled post endpoints
Summary
Mattermost versions 11.7.x <= 11.7.10 fail to validate reserved system post types on the scheduled post creation and publication paths which allows an authenticated channel member to publish messages rendering as trusted system events via the scheduled post endpoint.. Mattermost Advisory ID: MMSA-2026-00732
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-02 18:28 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.10
(semver)
Unaffected: 11.11.0 Unaffected: 11.7.11 |
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CVE-2026-116516 (GCVE-0-2026-116516)
Vulnerability from cvelistv5 – Published: 2026-10-26 13:56 – Updated: 2026-10-26 15:35
VLAI
EPSS
VEX
Title
Insufficient length validation when parsing Zoom chat transcriptions
Summary
Mattermost versions <=11.9 11.1.9 11.5.8 11.10.7.0 fail to validate Zoom chat line length before slicing which allows an authenticated attacker to crash the Agents plugin via summarizing a Zoom chat transcription containing short continuation lines. Mattermost Advisory ID: MMSA-2026-00723
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-26 14:54 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
<=11.9 11.1.9 11.5.8 11.10.7.0 , ≤ <=11.9 11.1.9 11.5.8 11.10.7.0
(semver)
Unaffected: 11.10.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 |
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CVE-2026-13411 (GCVE-0-2026-13411)
Vulnerability from cvelistv5 – Published: 2026-10-22 10:46 – Updated: 2026-10-22 13:37
VLAI
EPSS
VEX
Title
Null condition in Playbooks import crashes the plugin
Summary
Mattermost versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which allows an authenticated attacker to crash the Playbooks plugin instance-wide via a crafted import request containing a null condition. Mattermost Advisory ID: MMSA-2026-00709
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-22 12:53 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.11
(semver)
Unaffected: 11.10.0 Unaffected: 11.7.12 |
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CVE-2026-18799 (GCVE-0-2026-18799)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:16 – Updated: 2026-10-16 11:28
VLAI
EPSS
VEX
Title
Mattermost Server fails to restrict Slack import account binding, allowing team admins to forge posts as existing users
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to restrict Slack import account binding to system administrator-initiated imports which allows an authenticated attacker with team admin privileges to force-add existing Mattermost users to their team and forge posts attributed to those users' identities via a crafted Slack export containing target users' email addresses.. Mattermost Advisory ID: MMSA-2026-00757
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:28 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-16251 (GCVE-0-2026-16251)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:14 – Updated: 2026-10-16 11:57
VLAI
EPSS
VEX
Title
Mattermost local image proxy allows server memory exhaustion via unbounded image response buffering
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to limit the size of remote image responses buffered in memory during local image proxy direct fetches, which allows a remote attacker to cause memory exhaustion on the server via a crafted oversized image response.. Mattermost Advisory ID: MMSA-2026-00726
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:29 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-18256 (GCVE-0-2026-18256)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:13 – Updated: 2026-10-16 11:58
VLAI
EPSS
VEX
Title
Private team metadata disclosure via the team search API
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to properly restrict private teams from public team search results, which allows an authenticated user without permission to list private teams to disclose the ID, name, and display name of private teams via a modified team search request. Mattermost Advisory ID: MMSA-2026-00748
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:57 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
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CVE-2026-18223 (GCVE-0-2026-18223)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:12 – Updated: 2026-10-16 14:16
VLAI
EPSS
VEX
Title
Mattermost invitation tokens not bound to invited email address allowing unauthorized team and private channel access
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate the invited recipient's email address when redeeming team and guest invitation tokens, which allows an authenticated attacker to join a team or gain unauthorized access to private channels via a forwarded or leaked invitation link.. Mattermost Advisory ID: MMSA-2026-00747
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 14:16 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-19076 (GCVE-0-2026-19076)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:11 – Updated: 2026-10-16 14:06
VLAI
EPSS
VEX
Title
Mattermost fails to reject OAuth application sessions in account type switch, allowing account takeover via bearer token
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to reject OAuth application sessions in the account type switch endpoint, which allows an attacker with a valid OAuth bearer token for a target user to permanently take over that user's SSO-backed account by setting an attacker-controlled password and detaching the account from its identity provider via a crafted request to POST /api/v4/users/login/switch.. Mattermost Advisory ID: MMSA-2026-00758
Severity
4.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 14:06 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-18560 (GCVE-0-2026-18560)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:10 – Updated: 2026-10-16 14:17
VLAI
EPSS
VEX
Title
Improper order of authorisations in Mattermost GetFile API leads to an authenticated user to determine a post’s quarantined status
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to validate user’s permissions before other validations which allows non-content reviewers to infer a post’s flagged status via direct API call.. Mattermost Advisory ID: MMSA-2026-00754
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 14:17 UTC
CWE
- CWE-203 - Observable Discrepancy
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-16453 (GCVE-0-2026-16453)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:08 – Updated: 2026-10-16 14:18
VLAI
EPSS
VEX
Title
Mattermost SAML RelayState forgery allows unauthorized team membership
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to verify the integrity of the SAML RelayState POST parameter which allows an authenticated SAML user to join any team, including invite-only teams, via forging the team_id or invite_id fields in the RelayState.. Mattermost Advisory ID: MMSA-2026-00727
Severity
7.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 14:17 UTC
CWE
- CWE-472 - External Control of Assumed-Immutable Web Parameter
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-19600 (GCVE-0-2026-19600)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:07 – Updated: 2026-10-16 12:02
VLAI
EPSS
VEX
Title
Mattermost logs plaintext authentication tokens in debug-level server logs on failed auth attempts
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize authentication tokens before writing them to server log entries, which allows an attacker with access to server logs to obtain valid session tokens or OAuth access tokens and impersonate authenticated users via the debug-level Mattermost server log.. Mattermost Advisory ID: MMSA-2026-00763
Severity
4.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 12:02 UTC
CWE
- CWE-532 - Insertion of Sensitive Information into Log Files
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Affected: 11.10.0 , ≤ 11.10.1 (semver) Unaffected: 11.11.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 Unaffected: 11.10.2 |
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CVE-2026-19621 (GCVE-0-2026-19621)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:06 – Updated: 2026-10-16 11:58
VLAI
EPSS
VEX
Title
Mattermost leaks interactive-message integration secrets to non-admin users via post-deletion events and thread reads
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to strip action integration secrets from post payloads before broadcasting post-deletion web socket events and returning thread API responses, which allows an authenticated channel member to obtain server-side webhook URLs and authentication context from interactive-message posts via the post_deleted websocket event or the threads REST API.. Mattermost Advisory ID: MMSA-2026-00766
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:58 UTC
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
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Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-19603 (GCVE-0-2026-19603)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:02 – Updated: 2026-10-16 11:59
VLAI
EPSS
VEX
Title
Private channel ID disclosure via user status endpoints
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to sanitize the active channel field returned by the user status API endpoints, which allows an authenticated user to learn the channel ID of a private channel another user is actively viewing via the status endpoints, without being a member of that channel. Mattermost Advisory ID: MMSA-2026-00765
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:58 UTC
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Affected: 11.10.0 , ≤ 11.10.1 (semver) Unaffected: 11.11.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 Unaffected: 11.10.2 |
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CVE-2026-18795 (GCVE-0-2026-18795)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:01 – Updated: 2026-10-16 11:59
VLAI
EPSS
VEX
Title
Missing server side validation allowed user to quarantine a DM and GM post
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.7.x <= 11.7.9, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5 fail to enforce DM/GM check on server side which allows an authenticated user to quarantine a post belonging to DM or GM via direct API call.. Mattermost Advisory ID: MMSA-2026-00756
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:59 UTC
CWE
- CWE-862 - Missing Authorization
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.7.0 , ≤ 11.7.9 (semver) Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.7.10 Unaffected: 11.9.2 Unaffected: 11.8.6 |
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CVE-2026-19867 (GCVE-0-2026-19867)
Vulnerability from cvelistv5 – Published: 2026-10-16 07:00 – Updated: 2026-10-16 12:00
VLAI
EPSS
VEX
Title
Uncapped mention keys in user notification properties allow CPU exhaustion during post processing
Summary
Mattermost versions 11.10.x <= 11.10.0, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to cap the number and size of mention keys stored in a user's notification properties, and to bound the quadratic multibyte-keyword matching performed for each post, which allows an authenticated user to degrade post-processing latency and consume excessive CPU on behalf of other members of any channel they share via storing an oversized notify_props.mention_keys list on their own profile.. Mattermost Advisory ID: MMSA-2026-00773
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 11:59 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
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Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
11.10.0 , ≤ 11.10.0
(semver)
Affected: 11.9.0 , ≤ 11.9.1 (semver) Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Unaffected: 11.11.0 Unaffected: 11.10.1 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 |
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CVE-2026-19601 (GCVE-0-2026-19601)
Vulnerability from cvelistv5 – Published: 2026-10-16 06:58 – Updated: 2026-10-16 12:00
VLAI
EPSS
VEX
Title
Disclosure of AD/LDAP bind password via Test Connection
Summary
Mattermost versions 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10, 11.10.x <= 11.10.1 fail to invalidate the stored AD/LDAP bind password when other connection settings (such as the server address) are changed, which allows a System Console administrator to disclose the plaintext bind password to an attacker-controlled server via the Test Connection / diagnostics feature. Mattermost Advisory ID: MMSA-2026-00764
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 12:00 UTC
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
Mattermost
CNA
References
1 reference
| URL | Tags |
|---|---|
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Impacted products
1 product
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|---|---|---|---|
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Affected:
11.9.0 , ≤ 11.9.1
(semver)
Affected: 11.8.0 , ≤ 11.8.5 (semver) Affected: 11.7.0 , ≤ 11.7.10 (semver) Affected: 11.10.0 , ≤ 11.10.1 (semver) Unaffected: 11.11.0 Unaffected: 11.9.2 Unaffected: 11.8.6 Unaffected: 11.7.11 Unaffected: 11.10.2 |
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