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Full vulnerability report · 2026
CVE-2026-20944High confidence

Microsoft Word Remote Code Execution Vulnerability

Microsoft · Microsoft 365 Apps for Enterprise

8.4HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-2144

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

What

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Out-of-bounds Read → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
UnauthenticatedRemote code executionCWE-125
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2026-0081Microsoft Office Produkte: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in verschiedenen Microsoft Office Produkten und Sharepoint ausnutzen, um beliebigen Programmcode auszuführen, um Informationen offenzulegen, um falsche Informationen darzustellen, und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260114Security Bulletin 14 Jan 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 14 Jan 2026, published on 14 January 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0043Multiples vulnérabilités dans Microsoft Office

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.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-001544マイクロソフトのMicrosoft 365 Apps等の複数製品における境界外読み取りに関する脆弱性

Microsoft Office Wordにおける境界外読み取りの脆弱性により、不正な攻撃者がローカル環境でコードを実行できる可能性があります。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6667MS 1월 보안 위협에 따른 정기 보안 업데이트 권고

| | Microsoft Office | CVE-2026-20953 | Microsoft Office 원격 코드 실행 취약성 | | Microsoft Office | CVE-2026-20952 | Microsoft Office 원격 코드 실행 취약성 | | Microsoft Office SharePoint | CVE-2026-20951 | Microsoft SharePoint Server 원격 코드 실행 취약성 | | Microsoft Office Excel | CVE-2026-20950 | Microsoft Excel 원격 코드 실행 취약성 | | Microsoft Office Excel | CVE-2026-20949 | Microsoft Excel 보안 기능 우회 취약성 | | Microsoft Office Word | CVE-2026-20948 | Microsoft Word 원격 코드 실행 취약성 | | Microsoft Office SharePoint | CVE-2026-20947 | Microsoft SharePoint Server 원격 코드 실행 취약성 | | Microsoft Office Excel | CVE-2026-20946 | Microsoft Excel 원격 코드 실행 취약성 | | Microsoft Office Word | CVE-2026-20944 | Microsoft Word 원격 코드 실행 취약성 | | Microsoft Office | CVE-2026-20943 | Microsoft Office 간편 실행 권한 상승 취약성 | | Host Process for Windows Tasks | CVE-2026-20941 | Host Process for Windows Tasks Elevation of Privilege Vulnerability | | Windows Cloud Files Mini Filter Driver | CVE-2026-20940 | Windows 클라우드 파일 미니 필터 드라이버 권한 상승 취약성 | | Windows File Explorer | CVE-2026-20939 | Windows 파일 탐색기 정보 공개 취약성 | | Windows Virtualization-Based Security (VBS) Enclave | CVE-2026-20938 | Windows VBS(가상화 기반 보안) 엔클레이브 권한 상승 취약성 | | Windows File Explorer | CVE-2026-20937 | Windows 파일 탐색기 정보 공개 취약성 | | Windows NDIS | CVE-2026-20936 | Windows NDIS 정보 유출 취약성 | | Windows

Official advisory ↗
NCSC-NL · Dutch · NCSC-2026-0010Kwetsbaarheden verholpen in Microsoft Office

Een kwaadwillende kan de kwetsbaarheden misbruiken om zich voor te doen als andere gebruiker, toegang te krijgen tot gevoelige gegevens of willekeurige code uit te voeren in de context van het slachtoffer. Voor succesvol misbruik moet de kwaadwillende geauthenticeerd zijn op het kwetsbare systeem, of het slachtoffer misleiden een malafide bestand te openen of link te volgen. Van de kwetsbaarheid met kenmerk CVE-2026-20963 wordt gemeld dat deze actief en gericht is misbruikt. De kwetsbaarheid stelt een kwaadwillende in staat om willekeurige code uit te voeren op een kwetsbaar Sharepoint systeem. Met name publiek toegankelijke installaties lopen verhoogd risico op misbruik. Buiten meldingen van actief misbruik is (nog) geen publieke Proof-of-Concept-code of exploit bekend. Door de media-aandacht echter, verwacht het NCSC dat deze wellicht op korte termijn beschikbaar komt, waardoor het risico op grootschalig misbruik zal toenemen. ``` Microsoft Office Word: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-20944 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20948 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Microsoft Office SharePoint: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-20947 | 8.80 | Uitvoeren van willekeurige code | | CVE-2026-20951 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20959 | 4.60 | Voordoen als andere gebruiker | | CVE-2026-20963 | 8.80 | Uitvoeren van willekeurige code | | CVE-2026-20958 | 5.40 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Microsoft Office: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-20943 | 7.00 | Uitvoeren van willekeurige code | | CVE-2026-20953 | 8.40 | Uitvoeren van willekeurige code | | CVE-2026-20952 | 8.40 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Microsoft Office Excel: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-20946 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20955 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20956 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20949 | 7.80 | Omzeilen van beveiligingsmaatregel | | CVE-2026-20950 | 7.80 | Uitvoeren van willekeurige code | | CVE-2026-20957 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| ```

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 13 Jan 2026 · Last source change 30 Jul 2026, 20:47 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-2144
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. BlackTree coverageBlackTree article coverage changed from no BlackTree article to 1 BlackTree article.
    Before
    no BlackTree article
    After
    1 BlackTree article
    BlackTree editorial ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2026-2144↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-20944 · cve.blacktree.nl