Sep 2026: Microsoft Office Word Information Disclosure Vulnerability
CVE-2026-78506 Published on September 8, 2026
Microsoft Office Word Information Disclosure Vulnerability
Improper null termination in Microsoft Office Word allows an unauthorized attacker to disclose information locally.
Weakness Type
Improper Null Termination
The software does not terminate or incorrectly terminates a string or array with a null character or equivalent terminator. Null termination errors frequently occur in two different ways. An off-by-one error could cause a null to be written out of bounds, leading to an overflow. Or, a program could use a strncpy() function call incorrectly, which prevents a null terminator from being added at all. Other scenarios are possible.
Products Associated with CVE-2026-78506
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Affected Versions
Microsoft 365 Apps for Enterprise:- Version 16.0.1 and below 16.0.20326.20138 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.
- Version 16.0.1 and below 16.0.5569.1000 is affected.