Sep 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-81958 Published on September 8, 2026
Microsoft Excel Information Disclosure Vulnerability
Use of uninitialized resource in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Weakness Type
Use of Uninitialized Resource
The software uses or accesses a resource that has not been initialized. When a resource has not been properly initialized, the software may behave unexpectedly. This may lead to a crash or invalid memory access, but the consequences vary depending on the type of resource and how it is used within the software.
Products Associated with CVE-2026-81958
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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.