CVE-2025-53782

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2025-53782 is fixed in 4 products on 1 platform, first by KB5066369, released October 14, 2025. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.4

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0037

30th percentile

<p>Incorrect implementation of authentication algorithm in Microsoft Exchange Server allows an unauthorized attacker to elevate privileges locally.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5066369	Oct 14, 2025
Microsoft Exchange Server 2019 Cumulative Update 14	KB5066368	Oct 14, 2025
Microsoft Exchange Server 2019 Cumulative Update 15	KB5066367	Oct 14, 2025
Microsoft Exchange Server Subscription Edition RTM	KB5066366	Oct 14, 2025

Details

Published
October 14, 2025
Weakness
Incorrect Implementation of Authentication Algorithm
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53782

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