Missing Authorization in Microsoft Exchange Server - CVE-2026-69641
Published: September 8, 2026
Vulnerability identifier: #VU147868
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69641
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to access or modify other users\' mailbox content.
The vulnerability exists due to missing authorization in Microsoft Exchange Server when processing specially crafted network requests. A remote privileged user can send a specially crafted request to bypass mailbox authorization checks and access or modify other users\' mailbox content.
No user interaction is required.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2026-69641
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