Jul 2026: Microsoft Excel Information Disclosure Vulnerability
CVE-2026-50678 Published on July 14, 2026
Microsoft Excel Information Disclosure Vulnerability
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-50678
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0.0 and below 16.0.5561.1001 is affected.
- Version 19.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 1.0.0 and below 16.111.26071215 is affected.
- Version 16.0.1 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.0 and below https://aka.ms/OfficeSecurityReleases is affected.
- Version 16.0.1 and below 16.111.26071215 is affected.
- Version 16.0.0 and below 16.111.26071215 is affected.
- Version 16.0.0.0 and below 16.0.10417.20175 is affected.