CVE-2026-118157

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2026-118157 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

7.2

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

<p>Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges 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
Weak Authentication
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118157

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