Missing Authorization in Microsoft Exchange Server - CVE-2026-62915
Published: August 11, 2026
Vulnerability identifier: #VU141478
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-62915
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to bypass a security feature.
The vulnerability exists due to missing authorization in Microsoft Exchange Server when handling requests to install mail add-ins. A remote user can send a crafted request to bypass a role-based restriction intended to control which users are allowed to install mail add-ins.
A successful exploit could allow installation of an add-in that requests elevated mailbox permissions that an administrator's policy was intended to prevent.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2026-62915
Install security update from vendor's website.
Microsoft Exchange Server - addressed in versions 15.01.2507.072, 15.02.1544.044, 15.02.1748.049, 15.02.2562.046