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CERTFR-2026-AVI-0752
Vulnerability from certfr_avis
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 10.11.x antérieures à 10.11.20 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.6.x antérieures à 11.6.5 | ||
| Mattermost | Mattermost Server | Mattermost Server versions 11.7.x antérieures à 11.7.3 |
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Mattermost Server versions 10.11.x ant\u00e9rieures \u00e0 10.11.20",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.6.x ant\u00e9rieures \u00e0 11.6.5",
"product": {
"name": "Mattermost Server",
"vendor": {
"name": "Mattermost",
"scada": false
}
}
},
{
"description": "Mattermost Server versions 11.7.x ant\u00e9rieures \u00e0 11.7.3",
"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": [
{
"name": "CVE-2026-10106",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10106"
},
{
"name": "CVE-2026-9708",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9708"
},
{
"name": "CVE-2026-6850",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6850"
},
{
"name": "CVE-2026-10085",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10085"
},
{
"name": "CVE-2026-10103",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-10103"
},
{
"name": "CVE-2026-9820",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9820"
},
{
"name": "CVE-2026-9824",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9824"
},
{
"name": "CVE-2026-6541",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6541"
},
{
"name": "CVE-2026-9571",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9571"
}
],
"initial_release_date": "2026-06-15T00:00:00",
"last_revision_date": "2026-08-14T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0752",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-06-15T00:00:00.000000"
},
{
"description": "Ajout d\u0027identifiants CVE et modification des risques en cons\u00e9quence.",
"revision_date": "2026-08-14T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Atteinte \u00e0 l\u0027int\u00e9grit\u00e9 des donn\u00e9es"
},
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
}
],
"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": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00683",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00680",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00671",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00658",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00653",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00688",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00690",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00676",
"url": "https://mattermost.com/security-updates/"
},
{
"published_at": "2026-06-12",
"title": "Bulletin de s\u00e9curit\u00e9 Mattermost MMSA-2026-00689",
"url": "https://mattermost.com/security-updates/"
}
]
}
CVE-2026-6541 (GCVE-0-2026-6541)
Vulnerability from cvelistv5
Published
2026-07-13 10:53
Modified
2026-07-13 13:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user’s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.1 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-6541",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-13T13:09:03.398556Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T13:09:10.482Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "11.7.1",
"status": "affected",
"version": "11.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.6.4",
"status": "affected",
"version": "11.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "10.11.19",
"status": "affected",
"version": "10.11.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "11.8.0"
},
{
"status": "unaffected",
"version": "11.7.2"
},
{
"status": "unaffected",
"version": "11.6.5"
},
{
"status": "unaffected",
"version": "10.11.20"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "hfreak_s"
}
],
"descriptions": [
{
"lang": "en",
"value": "Mattermost versions 11.7.x \u003c= 11.7.1, 11.6.x \u003c= 11.6.4, 10.11.x \u003c= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user\u2019s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T10:53:15.958Z",
"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"shortName": "Mattermost"
},
"references": [
{
"name": "MMSA-2026-00653",
"tags": [
"vendor-advisory"
],
"url": "https://mattermost.com/security-updates"
}
],
"solutions": [
{
"lang": "en",
"value": "Update Mattermost to versions 11.8.0, 11.7.2, 11.6.5, 10.11.20 or higher."
}
],
"source": {
"advisory": "MMSA-2026-00653",
"defect": [
"https://mattermost.atlassian.net/browse/MM-68371"
],
"discovery": "EXTERNAL"
},
"title": "Unscoped updates to other playbooks\u0027 metric configuration",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"assignerShortName": "Mattermost",
"cveId": "CVE-2026-6541",
"datePublished": "2026-07-13T10:53:15.958Z",
"dateReserved": "2026-04-17T17:54:44.831Z",
"dateUpdated": "2026-07-13T13:09:10.482Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-6850 (GCVE-0-2026-6850)
Vulnerability from cvelistv5
Published
2026-07-13 08:13
Modified
2026-07-13 13:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-6850",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-13T13:56:09.905130Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T13:56:16.767Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "11.7.2",
"status": "affected",
"version": "11.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.6.4",
"status": "affected",
"version": "11.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "10.11.19",
"status": "affected",
"version": "10.11.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "11.8.0"
},
{
"status": "unaffected",
"version": "11.7.3"
},
{
"status": "unaffected",
"version": "11.6.5"
},
{
"status": "unaffected",
"version": "10.11.20"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "idr"
}
],
"descriptions": [
{
"lang": "en",
"value": "Mattermost versions 11.7.x \u003c= 11.7.2, 11.6.x \u003c= 11.6.4, 10.11.x \u003c= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1333",
"description": "CWE-1333: Inefficient Regular Expression Complexity",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T08:13:02.883Z",
"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"shortName": "Mattermost"
},
"references": [
{
"name": "MMSA-2026-00658",
"tags": [
"vendor-advisory"
],
"url": "https://mattermost.com/security-updates"
}
],
"solutions": [
{
"lang": "en",
"value": "Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5, 10.11.20 or higher."
}
],
"source": {
"advisory": "MMSA-2026-00658",
"defect": [
"https://mattermost.atlassian.net/browse/MM-68424"
],
"discovery": "EXTERNAL"
},
"title": "Crafted message attachment causes client-side denial of service via markdown parser regex backtracking in Mattermost",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"assignerShortName": "Mattermost",
"cveId": "CVE-2026-6850",
"datePublished": "2026-07-13T08:13:02.883Z",
"dateReserved": "2026-04-22T10:05:15.625Z",
"dateUpdated": "2026-07-13T13:56:16.767Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-9708 (GCVE-0-2026-9708)
Vulnerability from cvelistv5
Published
2026-07-13 08:00
Modified
2026-07-13 14:45
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-9708",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-13T14:44:57.510921Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T14:45:16.207Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "11.7.2",
"status": "affected",
"version": "11.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.6.4",
"status": "affected",
"version": "11.6.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "10.11.19",
"status": "affected",
"version": "10.11.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "11.8.0"
},
{
"status": "unaffected",
"version": "11.7.3"
},
{
"status": "unaffected",
"version": "11.6.5"
},
{
"status": "unaffected",
"version": "10.11.20"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "arang"
}
],
"descriptions": [
{
"lang": "en",
"value": "Mattermost versions 11.7.x \u003c= 11.7.2, 11.6.x \u003c= 11.6.4, 10.11.x \u003c= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683"
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639: Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-13T08:00:10.707Z",
"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"shortName": "Mattermost"
},
"references": [
{
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"tags": [
"vendor-advisory"
],
"url": "https://mattermost.com/security-updates"
}
],
"solutions": [
{
"lang": "en",
"value": "Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5, 10.11.20 or higher."
}
],
"source": {
"advisory": "MMSA-2026-00683",
"defect": [
"https://mattermost.atlassian.net/browse/MM-69009"
],
"discovery": "EXTERNAL"
},
"title": "Incoming webhook user attribution via unvalidated webhook owner",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"assignerShortName": "Mattermost",
"cveId": "CVE-2026-9708",
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CVE-2026-9824 (GCVE-0-2026-9824)
Vulnerability from cvelistv5
Published
2026-07-13 10:47
Modified
2026-07-13 13:10
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-862 - Missing Authorization
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
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CVE-2026-9571 (GCVE-0-2026-9571)
Vulnerability from cvelistv5
Published
2026-07-13 07:50
Modified
2026-07-15 04:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-305 - – Authentication Bypass by Primary Weakness
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
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CVE-2026-10085 (GCVE-0-2026-10085)
Vulnerability from cvelistv5
Published
2026-07-13 08:05
Modified
2026-07-13 13:57
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-862 - Missing Authorization
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict the group_constrained channel flag to public and private channels that support group synchronization, which allows an ordinary group or direct message member to remove all participants from the conversation via the channel patch API.. Mattermost Advisory ID: MMSA-2026-00688
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
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CVE-2026-10103 (GCVE-0-2026-10103)
Vulnerability from cvelistv5
Published
2026-07-13 07:57
Modified
2026-07-14 14:32
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing arbitrary post IDs in channels shared with that remote.. Mattermost Advisory ID: MMSA-2026-00689
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
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CVE-2026-10106 (GCVE-0-2026-10106)
Vulnerability from cvelistv5
Published
2026-07-13 08:09
Modified
2026-07-13 13:56
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-863 - Incorrect Authorization
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 11.6.0 ≤ 11.6.4 Version: 10.11.0 ≤ 10.11.19 |
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CVE-2026-9820 (GCVE-0-2026-9820)
Vulnerability from cvelistv5
Published
2026-07-13 10:51
Modified
2026-07-13 13:09
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-862 - Missing Authorization
Summary
Mattermost versions 11.7.x <= 11.7.2, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API endpoint.. Mattermost Advisory ID: MMSA-2026-00671
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Mattermost | Mattermost |
Version: 11.7.0 ≤ 11.7.2 Version: 10.11.0 ≤ 10.11.19 |
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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