Auth bypass in Microsoft Exchange Server 2016 Cumulative Update 23
CVE-2026-62915
Missing authorization in Microsoft Exchange Server allows an authorized attacker to bypass a security feature over a network.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Microsoft Exchange Server 2016 Cumulative Update 23 — versions 15.01.0.0
- Microsoft Exchange Server 2019 Cumulative Update 14 — versions 15.02.0.0
- Microsoft Exchange Server 2019 Cumulative Update 15 — versions 15.02.0.0
- Microsoft Exchange Server Subscription Edition Rtm — versions 15.02.0.0
Weakness classification (CWE)
References
- Microsoft Exchange Server Security Feature Bypass Vulnerability (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-62915?
- CVE-2026-62915 is a medium-severity vulnerability in Microsoft Exchange Server 2016 Cumulative Update 23, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-08-11.
- How severe is CVE-2026-62915?
- Medium severity. CVSS v3 base score is 6.5 out of 10.