CVE-2026-118207

Microsoft Exchange Server Remote Code Execution Vulnerability

CVE-2026-118207 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, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

8.8

Critical

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

n/a

<p>Improper input validation in Microsoft Exchange Server allows an authorized attacker to execute code 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
Use of Incorrectly-Resolved Name or Reference
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118207

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