CVE-2026-118153

Microsoft Exchange Server Denial of Service Vulnerability

CVE-2026-118153 is fixed in Microsoft Exchange Server Subscription Edition RTM on 1 platform by KB5133453 (version ), released November 10, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

<p>Inefficient algorithmic complexity in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Microsoft Exchange Server Subscription Edition RTM		KB5133453	Nov 10, 2026

Details

Published
November 10, 2026
Weakness
Inefficient Algorithmic Complexity
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118153

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