CVE-2026-33372 Cross-site request forgery in n/a

Medium 5.4 Published 20 Mar 2026 Updated 23 Mar 2026

Attackers can perform unauthorized actions on behalf of authenticated users via CSRF due to improper token validation in Zimbra Webmail.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-33372?

CVE-2026-33372 is a medium-severity vulnerability in Synacor Zimbra Collaboration Suite, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-352

Which versions are affected by CVE-2026-33372?

It affects 1 product.

Products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2026-33372?

No fix has been published for CVE-2026-33372 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-33372 being exploited?

There is no known exploitation of CVE-2026-33372 in the wild and no public exploit code.

All Synacor Zimbra Collaboration Suite vulnerabilities

Sources

Also known as GHSA-fmww-x8fc-gqfj.