Sep 2026: Microsoft Excel Remote Code Execution Vulnerability
CVE-2026-81950 Published on September 8, 2026
Microsoft Excel Remote Code Execution Vulnerability
Double free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Weakness Type
What is a Double-free Vulnerability?
The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. When a program calls free() twice with the same argument, the program's memory management data structures become corrupted. This corruption can cause the program to crash or, in some circumstances, cause two later calls to malloc() to return the same pointer. If malloc() returns the same value twice and the program later gives the attacker control over the data that is written into this doubly-allocated memory, the program becomes vulnerable to a buffer overflow attack.
CVE-2026-81950 has been classified to as a Double-free vulnerability or weakness.
Products Associated with CVE-2026-81950
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below 16.0.20326.20138 is affected.
- Version 16.0.0.0 and below 16.0.5569.1003 is affected.
- Version 16.0.0 and below 16.0.5569.1003 is affected.
- Version 19.0.0 and below 16.0.10417.20207 is affected.
- Version - is affected.
- Version 16.0.1 and below 16.0.14334.20906 is affected.
- Version 16.0.0 and below 16.0.17932.20976 is affected.
- Version - is affected.
- Version - is affected.