CSRF in Synacor Zimbra Collaboration Suite
CVE-2026-33372
An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A cross-site request forgery (CSRF) vulnerability exists in Zimbra Webmail due to improper validation of CSRF tokens. The application accepts CSRF tokens supplied within the request body instead of requiring them through the expected request header. An attacker can exploit this issue by tricking an authenticated user into submitting a crafted request. This may allow unauthorized actions to be performed on behalf of the victim.
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.001 (4.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
Affected products
- Synacor Zimbra_collaboration_suite
- N/a — versions n/a
Weakness classification (CWE)
References
- cve@mitre.org (Vendor Advisory)
- cve@mitre.org (Release Notes, Vendor Advisory)
- cve@mitre.org (Product)
- cve@mitre.org (Release Notes)
Frequently asked questions
- What is CVE-2026-33372?
- CVE-2026-33372 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-03-20.
- How severe is CVE-2026-33372?
- Medium severity. CVSS v3 base score is 5.4 out of 10.