Cross-site request forgery in Zimbra Collaboration - CVE-2026-33373
Published: November 6, 2025 / Updated: April 21, 2026
Vulnerability identifier: #VU118167
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33373
CWE-ID: CWE-352
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 perform cross-site request forgery attacks.
The vulnerability exists due to insufficient validation of the HTTP request origin in specific authentication flows. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website.
How to mitigate CVE-2026-33373
Install updates from vendor's website.