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CERTFR-2026-AVI-0043
Vulnerability from certfr_avis
De multiples vulnérabilités ont été découvertes dans Microsoft Office. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance et 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 | ||
|---|---|---|---|---|
| Microsoft | Office | Microsoft Office LTSC 2021 pour éditions 64 bits | ||
| Microsoft | Office | Office Online Server versions antérieures à 16.0.10417.20083 | ||
| Microsoft | Office | Microsoft Office LTSC 2021 pour éditions 32 bits | ||
| Microsoft | Office | Microsoft Excel 2016 (édition 64 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office 2019 pour éditions 32 bits | ||
| Microsoft | Office | Microsoft 365 Apps pour Enterprise pour systèmes 64 bits | ||
| Microsoft | Office | Microsoft Office Deployment Tool versions antérieures à 16.0.19426.20170 | ||
| Microsoft | Office | Microsoft Office 2019 pour éditions 64 bits | ||
| Microsoft | Office | Microsoft Office LTSC pour Mac 2024 versions antérieures à 16.105.26011018 | ||
| Microsoft | Office | Microsoft Excel 2016 (édition 32 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office 2016 (édition 32 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office LTSC 2024 pour éditions 64 bits | ||
| Microsoft | Office | Microsoft Word 2016 (édition 64 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office LTSC pour Mac 2021 versions antérieures à 16.105.26011018 | ||
| Microsoft | Office | Microsoft Word 2016 (édition 32 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office 2016 (édition 64 bits) versions antérieures à 16.0.5535.1000 | ||
| Microsoft | Office | Microsoft Office LTSC 2024 pour éditions 32 bits | ||
| Microsoft | Office | Microsoft 365 Apps pour Enterprise pour systèmes 32 bits |
References
| Title | Publication Time | Tags | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Microsoft Office LTSC 2021 pour \u00e9ditions 64 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Office Online Server versions ant\u00e9rieures \u00e0 16.0.10417.20083",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office LTSC 2021 pour \u00e9ditions 32 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Excel 2016 (\u00e9dition 64 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office 2019 pour \u00e9ditions 32 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft 365 Apps pour Enterprise pour syst\u00e8mes 64 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office Deployment Tool versions ant\u00e9rieures \u00e0 16.0.19426.20170",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office 2019 pour \u00e9ditions 64 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office LTSC pour Mac 2024 versions ant\u00e9rieures \u00e0 16.105.26011018",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Excel 2016 (\u00e9dition 32 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office 2016 (\u00e9dition 32 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office LTSC 2024 pour \u00e9ditions 64 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Word 2016 (\u00e9dition 64 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office LTSC pour Mac 2021 versions ant\u00e9rieures \u00e0 16.105.26011018",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Word 2016 (\u00e9dition 32 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office 2016 (\u00e9dition 64 bits) versions ant\u00e9rieures \u00e0 16.0.5535.1000",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft Office LTSC 2024 pour \u00e9ditions 32 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"scada": false
}
}
},
{
"description": "Microsoft 365 Apps pour Enterprise pour syst\u00e8mes 32 bits",
"product": {
"name": "Office",
"vendor": {
"name": "Microsoft",
"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-2026-20957",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20957"
},
{
"name": "CVE-2026-20943",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20943"
},
{
"name": "CVE-2026-20948",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20948"
},
{
"name": "CVE-2026-20956",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20956"
},
{
"name": "CVE-2026-20955",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20955"
},
{
"name": "CVE-2026-20952",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20952"
},
{
"name": "CVE-2026-20950",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20950"
},
{
"name": "CVE-2026-20949",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20949"
},
{
"name": "CVE-2026-20946",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20946"
},
{
"name": "CVE-2026-20953",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20953"
},
{
"name": "CVE-2026-20944",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-20944"
}
],
"initial_release_date": "2026-01-14T00:00:00",
"last_revision_date": "2026-01-14T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0043",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-01-14T00:00:00.000000"
}
],
"risks": [
{
"description": "Ex\u00e9cution de code arbitraire \u00e0 distance"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans Microsoft Office. Elles permettent \u00e0 un attaquant de provoquer une ex\u00e9cution de code arbitraire \u00e0 distance et un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Microsoft Office",
"vendor_advisories": [
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20953",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20953"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20949",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20949"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20956",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20956"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20946",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20946"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20955",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20955"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20950",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20950"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20957",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20957"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20944",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20944"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20952",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20952"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20943",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20943"
},
{
"published_at": "2026-01-13",
"title": "Bulletin de s\u00e9curit\u00e9 Microsoft Office CVE-2026-20948",
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20948"
}
]
}
CVE-2026-20944 (GCVE-0-2026-20944)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
Summary
Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||
|
||||||||||||||
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}
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-20949 (GCVE-0-2026-20949)
Vulnerability from cvelistv5
Published
2026-01-13 17:57
Modified
2026-04-01 13:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-284 - Improper Access Control
Summary
Improper access control in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||
|
||||||||||||||||||||||||
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"vendor": "Microsoft",
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CVE-2026-20953 (GCVE-0-2026-20953)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||
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CVE-2026-20957 (GCVE-0-2026-20957)
Vulnerability from cvelistv5
Published
2026-01-13 17:57
Modified
2026-04-01 13:49
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
|||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||
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CVE-2026-20952 (GCVE-0-2026-20952)
Vulnerability from cvelistv5
Published
2026-01-13 17:57
Modified
2026-04-01 13:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||
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CVE-2026-20956 (GCVE-0-2026-20956)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-822 - Untrusted Pointer Dereference
Summary
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||
|
||||||||||||||||||||||||
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CVE-2026-20946 (GCVE-0-2026-20946)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-125 - Out-of-bounds Read
Summary
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||
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CVE-2026-20943 (GCVE-0-2026-20943)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-426 - Untrusted Search Path
Summary
Untrusted search path in Microsoft Office allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft Office 2016 |
Version: 16.0.0 < 16.0.5535.1000 |
||||||||||||||||||||||
|
||||||||||||||||||||||||
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CVE-2026-20955 (GCVE-0-2026-20955)
Vulnerability from cvelistv5
Published
2026-01-13 17:56
Modified
2026-04-01 13:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-822 - Untrusted Pointer Dereference
Summary
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||
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CVE-2026-20950 (GCVE-0-2026-20950)
Vulnerability from cvelistv5
Published
2026-01-13 17:57
Modified
2026-04-01 13:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-416 - Use After Free
Summary
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
|||||||||||||||||||||||||||||||||||||
|
|||||||||||||||||||||||||||||||||||||||
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CVE-2026-20948 (GCVE-0-2026-20948)
Vulnerability from cvelistv5
Published
2026-01-13 17:57
Modified
2026-04-01 13:49
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-822 - Untrusted Pointer Dereference
Summary
Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code locally.
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
| Vendor | Product | Version | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Version: 16.0.1 < https://aka.ms/OfficeSecurityReleases |
||||||||||||||||||||||||||||||||||||||||||
|
||||||||||||||||||||||||||||||||||||||||||||
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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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