Description
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
Affected products
microsoft: exchange server; microsoft: exchange server subscription edition
References1
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378 PatchVendor Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 1% percentile: 68 · as of 4 November 2026
- CWE
- CWE-674
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.