Improper authorization in Zimbra Collaboration - #VU126626
Published: April 21, 2026
Vulnerability identifier: #VU126626
CSH Severity: High
CVSS v4.0: 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/E:U/U:Amber
CVE-ID: N/A
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Synacor Inc.
Affected software:
Zimbra Collaboration
Zimbra Collaboration
Detailed vulnerability description
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.
Remediation
Install updates from vendor's website.