Nov 2026: Microsoft Exchange Server Denial of Service Vulnerability
CVE-2026-118153 Published on November 10, 2026
Microsoft Exchange Server Denial of Service Vulnerability
Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
Vulnerability Analysis
Weakness Type
Inefficient Algorithmic Complexity
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
Products Associated with CVE-2026-118153
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Affected Versions
Microsoft Exchange Server Subscription Edition RTM:- Version 15.02.0.0 and below 15.02.2562.057 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.