Sep 2026: Microsoft Office Outlook Remote Code Execution Vulnerability
CVE-2026-78519 Published on September 8, 2026
Microsoft Office Outlook Remote Code Execution Vulnerability
Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
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-2026-78519
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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 16.0.1 and below 16.0.14334.20906 is affected.
- Version 16.0.0 and below 16.0.17932.20976 is affected.
- Version 16.0.0.0 and below 16.0.5569.1000 is affected.