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CVE-2026-55121

MediumCVSS 5.5/10Last modified Jul 15, 2026

Description

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Microsoft 365 Apps for Enterprise	>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 2016	>= 16.0.0, < 16.0.5561.1000
Microsoft	Microsoft Office 2019	>= 19.0.0, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 365 for Mac	>= 1.0.0, < 16.111.26071215
Microsoft	Microsoft Office LTSC 2021	>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC 2024	>= 16.0.0, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC for Mac 2021	>= 16.0.1, < 16.111.26071215
Microsoft	Microsoft Office LTSC for Mac 2024	>= 16.0.0, < 16.111.26071215
Microsoft	Microsoft SharePoint Enterprise Server 2016	>= 16.0.0, < 16.0.5561.1001
Microsoft	Microsoft SharePoint Server 2019	>= 16.0.0, < 16.0.10417.20175
Microsoft	Microsoft SharePoint Server Subscription Edition	>= 16.0.0, < 16.0.19725.20434

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55121Patch, Vendor Advisory

Timeline

Published: Jul 14, 2026
Last modified: Jul 15, 2026
NVD status: Analyzed

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CVE-2026-55121: Medium severity, CVSS 5.5 | Vulnix