Improper authorization in Zimbra Collaboration - #VU126626
Published: April 21, 2026
Vulnerability identifier: #VU126626
CSH Severity: High
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to reset passwords.
The vulnerability exists due to incorrect validation of tokens when resetting passwords in the ChangePassword API. A remote non-authenticated attacker can bypass token validation and perform unauthorized password reset.
Affected software
Zimbra Collaboration
Remediation
Install updates from vendor's website.
Zimbra Collaboration - addressed in versions 9.0.0 Patch 43, 10.0.12, 10.1.4