Incorrect authorization in Zimbra Collaboration - CVE-2026-50054
Published: August 21, 2026
Vulnerability identifier: #VU144526
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-50054
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to gain unauthorized mailbox access.
The vulnerability exists due to improper authorization in mailbox delegation when processing delegation actions. A remote user can perform crafted delegation actions to gain unauthorized mailbox access.
Affected software
Zimbra Collaboration
How to mitigate CVE-2026-50054
Install security update from vendor's website.
Zimbra Collaboration - update to 10.1.20