Aug 2026: Microsoft Exchange Server Elevation of Privilege Vulnerability
CVE-2026-62911 Published on August 11, 2026
Microsoft Exchange Server Elevation of Privilege Vulnerability
Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Vulnerability Analysis
Weakness Type
Authentication Bypass by Capture-replay
A capture-replay flaw exists when the design of the software makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). Capture-replay attacks are common and can be difficult to defeat without cryptography. They are a subset of network injection attacks that rely on observing previously-sent valid commands, then changing them slightly if necessary and resending the same commands to the server.
Products Associated with CVE-2026-62911
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Affected Versions
Microsoft Exchange Server 2016 Cumulative Update 23:- Version 15.01.0.0 and below 15.01.2507.072 is affected.
- Version 15.02.0.0 and below 15.02.1544.044 is affected.
- Version 15.02.0.0 and below 15.02.1748.049 is affected.
- Version 15.02.0.0 and below 15.02.2562.046 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.