Description
Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Affected products
microsoft: exchange server; microsoft: exchange server subscription edition
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59249 Vendor Advisory
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 58 · as of 9 November 2026
- CWE
- CWE-1390
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.