CVE-2026-55055
Microsoft Word Remote Code Execution Vulnerability
At a glance
- Severity
- HIGH 7.8
- EPSS
- EPSS 0.57 % · percentile 47 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- microsoft
- NVD status
- Analyzed
Description
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | 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 | microsoft |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | NVD · secure@microsoft.com (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2026-44196
- GCVE · GCVE-0-2026-55055
CERT-FR advisories
- CERTFR-2026-AVI-0872 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0868 — Multiples vulnérabilités dans Microsoft Office · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*< 16.0.19725.20434cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x64:*cpe:2.3:a:microsoft:word:2016:*:*:*:*:*:x86:*
Affected products
| Product | Versions |
|---|---|
| Microsoft · Microsoft 365 Apps for Enterprise | affected 16.0.1 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office 2019 | affected 19.0.0 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office 365 for Mac | affected 1.0.0 < 16.111.26071215 |
| Microsoft · Microsoft Office LTSC 2021 | affected 16.0.1 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office LTSC 2024 | affected 16.0.0 < https://aka.ms/OfficeSecurityReleases |
| Microsoft · Microsoft Office LTSC for Mac 2021 | affected 16.0.1 < 16.111.26071215 |
| Microsoft · Microsoft Office LTSC for Mac 2024 | affected 16.0.0 < 16.111.26071215 |
| Microsoft · Microsoft SharePoint Enterprise Server 2016 | affected 16.0.0 < 16.0.5561.1001 |
| Microsoft · Microsoft SharePoint Server 2019 | affected 16.0.0 < 16.0.10417.20175 |
| Microsoft · Microsoft SharePoint Server Subscription Edition | affected 16.0.0 < 16.0.19725.20434 |
| Microsoft · Microsoft Word 2016 | affected 16.0.1 < 16.0.5561.1000 |
References
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |