Jul 2026: Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2026-55005 Published on July 14, 2026
Microsoft Exchange Server Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.
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-2026-55005
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Affected Versions
Microsoft Exchange Server 2016 Cumulative Update 23:- Version 15.01.0.0 and below 15.01.2507.071 is affected.
- Version 15.02.0.0 and below 15.02.1544.043 is affected.
- Version 15.02.0.0 and below 15.02.1748.048 is affected.
- Version 15.02.0.0 and below 15.02.2562.045 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.