CVE-2026-81959

Microsoft Excel Remote Code Execution Vulnerability

State: Published
Severity: 7.8 High
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 27, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	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

Weaknesses

CWE-122 Heap-based Buffer Overflow
CWE-190 Integer Overflow or Wraparound

Affected Products

Product	Versions
Microsoft 365 Apps for EnterpriseMicrosoft	16.0.1 to before 16.0.20326.20140Affected
Microsoft Excel 2016Microsoft	16.0.0.0 to before 16.0.5569.1003Affected
Microsoft Office 2016Microsoft	16.0.0 to before 16.0.5569.1003Affected
Microsoft Office 2019Microsoft	19.0.0 to before 16.0.10417.20207Affected
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.113.26091433Affected
Microsoft Office LTSC 2021Microsoft	16.0.1 to before 16.0.14334.20906Affected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before 16.0.17932.20976Affected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.113.26091433Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.113.26091433Affected

References

Microsoft Excel Remote Code Execution Vulnerabilityvendor-advisorypatch

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