Use of a broken or risky cryptographic algorithm in Microsoft Exchange Server - CVE-2026-69382
Published: September 8, 2026
Vulnerability identifier: #VU147646
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69382
CWE-ID: CWE-327
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose credentials.
The vulnerability exists due to use of a broken or risky cryptographic algorithm in Microsoft Exchange Server when processing repeated requests using a valid encrypted authentication cookie. A remote attacker can make repeated requests to infer protected credentials to disclose credentials.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2026-69382
Install security update from vendor's website.
Microsoft Exchange Server - addressed in versions SE RTM Sep26SU 15.02.2562.049, 2016 CU23 Sep26SU 15.01.2507.073, 2019 CU14 Sep26SU 15.02.1544.046, 2019 CU15 Sep26SU 15.02.1748.051