MSRC-CVE-2026-62915 — Microsoft Exchange Server Security Feature Bypass Vulnerability

Summary

Impact: Security Feature Bypass. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What kind of security feature could be bypassed by successfully exploiting this vulnerability?
An authenticated attacker who successfully exploited this vulnerability could bypass a role-based restriction that is intended to control which users are allowed to install mail add-ins. By bypassing this control, a user could install an add-in that requests elevated mailbox permissions that an administrator's policy was meant to prevent.

Security updates
15.01.2507.072 — https://support.microsoft.com/help/5121576
15.02.2562.046 — https://support.microsoft.com/help/5121573
15.02.1748.049 — https://support.microsoft.com/help/5121574
15.02.1544.044 — https://support.microsoft.com/help/5121575

Vulnerabilities 1

Medium 6.5

CVE-2026-62915

Microsoft Exchange Server Security Feature Bypass Vulnerability

Missing authorization in Microsoft Exchange Server allows an authorized attacker to bypass a security feature over a network.

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server Subscription Edition RTM Microsoft Exchange Server 2019 Cumulative Update 14

Aug 11, 2026

Revision history

2026-08-11 #1
Information published.

References

CVE-2026-62915 Microsoft Exchange Server Security Feature Bypass Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62915
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss