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CVE-2026-55127

Microsoft Word Remote Code Execution Vulnerability

CVSS score

7.8

EPSS probability

%0.6

Risk score

0.0

Published

3 mo ago

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-55127 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-55127 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1microsoftMicrosoft 365 Apps for Enterprise View
2microsoftMicrosoft Office 2019 View
3microsoftMicrosoft Office 365 for Mac View
4microsoftMicrosoft Office LTSC 2021 View
5microsoftMicrosoft Office LTSC 2024 View
6microsoftMicrosoft Office LTSC for Mac 2021 View
7microsoftMicrosoft Office LTSC for Mac 2024 View
8microsoftMicrosoft SharePoint Enterprise Server 2016 View
9microsoftMicrosoft SharePoint Server 2019 View
10microsoftMicrosoft SharePoint Server Subscription Edition View
11microsoftMicrosoft Word 2016 View
12microsoft365 apps View
13microsoftmicrosoft 365 View
14microsoftoffice 2019 View
15microsoftoffice 2021 View
16microsoftoffice 2024 View
17microsoftoffice online server View
18microsoftsharepoint server View
19microsoftsharepoint server View
20microsoftsharepoint server View
21microsoftword View
Total affected vendors: 1|Products: 21

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
7.8CVSS 3.x—CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CMicrosoft MSRC
7.8CVSS V3_1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CCVE CNA
7.8CVSS V31HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

17 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

Microsoft Word Remote Code Execution Vulnerability

Open source
reference

Microsoft Word Remote Code Execution Vulnerability

Open source
reference

5002883

Open source
reference

Yama veya çözüm referansı

Open source
reference

5002885

Open source
reference

Yama veya çözüm referansı

Open source
reference

Yama veya çözüm referansı

Open source
reference

Release Notes

Open source
reference

5002890

Open source
reference

Yama veya çözüm referansı

Open source
reference

5002882

Open source
reference

Yama veya çözüm referansı

Open source
Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Apply the official update named in the evidence only to the matching product and version.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-55127 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-55127 weaknesses.

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsGerekmiyor
UserGerekiyor

Official Sources and Advisories

CVSS Vector Radar Chart

7.8 / 10
Attack VectorLocalComplexityLowPrivilegesNoneUser Interact.RequiredConfidentialityLowIntegrityHighAvailabilityHigh

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone required
User Interaction—
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)High
Availability (Erişilebilirlik)High

Yama doğrulandı

17 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

Weakness Type (CWE & CAPEC)

Similar Vulnerabilities

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

curl -H "x-api-key: $DAYBREACH_API_KEY" \
  "https://api.daybreach.dev/api/v1/intel/cves/CVE-2026-55127"