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CVE-2026-33373

8.8 · HIGH

An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1.

Published Mar 30, 2026CWE-352EPSS 0.32%

Overview

CVE-2026-33373 is a high-severity vulnerability. It was published on March 30, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A Cross-Site Request Forgery (CSRF) vulnerability exists in Zimbra Web Client due to the issuance of authentication tokens without CSRF protection during certain account state transitions. Specifically, tokens generated after operations such as enabling two-factor authentication or changing a password may lack CSRF enforcement. While such a token is active, authenticated SOAP requests that trigger token generation or state changes can be performed without CSRF validation. An attacker could exploit this by inducing a victim to submit crafted requests, potentially allowing sensitive account actions such as disabling two-factor authentication. The issue is mitigated by ensuring CSRF protection is consistently enforced for all issued authentication tokens.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwiki.zimbra.com/wiki/Security_CenterRefwiki.zimbra.com/wiki/Zimbra_Releases/10.0.18#Security_FixesRefwiki.zimbra.com/wiki/Zimbra_Releases/10.1.13#Security_FixesRefwiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy

How CyberStrike helps

Frequently asked questions

What is CVE-2026-33373?

CVE-2026-33373 is a high-severity vulnerability. It was published on March 30, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-33373?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-33373?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-33373?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-33373 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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