CVE-2026-55057

Microsoft Office Information Disclosure Vulnerability

State: Published
Severity: 5.5 Medium
Published: Jul 14, 2026
Updated: Nov 1, 2026
Reserved: Jun 16, 2026

Description

Integer overflow or wraparound in Microsoft Office allows an unauthorized attacker to disclose information locally.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Microsoft 365 Apps for EnterpriseMicrosoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 2016Microsoft	16.0.0 to before 16.0.5561.1000Affected
Microsoft Office 2019Microsoft	19.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.111.26071215Affected
Microsoft Office LTSC 2021Microsoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.111.26071215Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.111.26071215Affected

References

Microsoft Office Information Disclosure Vulnerabilityvendor-advisorypatch

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