What’s Vulnerable › Vulnerabilities

CVE-2026-33372

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-352

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.

Affected products

• Zimbra Collaboration: from 10.0.0 before 10.1.16 — fixed in 10.1.16

How to fix

Upgrade to a fixed version: Zimbra Collaboration 10.1.16. Check the vendor advisory for mitigations.

References

• https://wiki.zimbra.com/wiki/Security_Center
• https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.16#Security_Fixes
• https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

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