EUVD-2026-13698CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
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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.
Analysis
Zimbra Collaboration Server 10.0 and 10.1 accept CSRF tokens from request bodies instead of enforcing header-based validation, allowing attackers to perform unauthorized actions by deceiving authenticated users into submitting malicious requests. This CSRF bypass affects webmail users and could enable account compromise or sensitive data modification without user awareness. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify anti-CSRF tokens are enforced.
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