High severity7.5NVD Advisory· Published Sep 8, 2026· Updated Sep 29, 2026
CVE-2026-69378
CVE-2026-69378
Description
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
Affected products
5cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*+ 3 more
- cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*
- cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*
- (no CPE)
- cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*Range: <15.02.2562.049
Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378nvdPatchVendor Advisory
News mentions
2- Patch Tuesday - September 2026Rapid7 Blog · Sep 8, 2026
- Massive Microsoft Patch Tuesday September 2026 – 973 Vulnerabilities Fixed, Including 2 Zero-DaysCyber Security News · Sep 8, 2026