Oct 2026: Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-87696 Published on October 13, 2026
Microsoft Exchange Server Elevation of Privilege Vulnerability
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Weakness Type
Improper Verification of Cryptographic Signature
The software does not verify, or incorrectly verifies, the cryptographic signature for data.
Products Associated with CVE-2026-87696
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Affected Versions
Microsoft Exchange Server 2016 Cumulative Update 23:- Version 15.01.0.0 and below 15.01.2507.077 is affected.
- Version 15.02.0.0 and below 15.02.1544.050 is affected.
- Version 15.02.0.0 and below 15.02.1748.055 is affected.
- Version 15.02.0.0 and below 15.02.2562.056 is affected.