EUVD-2026-13694CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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3Tags
Description
An issue was discovered in Zimbra Collaboration (ZCS) 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Zimbra Briefcase feature due to insufficient sanitization of specific uploaded file types. When a user opens a publicly shared Briefcase file containing malicious scripts, the embedded JavaScript executes in the context of the user's session. This allows an attacker to run arbitrary scripts, potentially leading to data exfiltration or other unauthorized actions on behalf of the victim user.
Analysis
A stored cross-site scripting (XSS) vulnerability exists in Zimbra Collaboration Server (ZCS) versions 10.0 and 10.1 within the Briefcase feature, caused by insufficient sanitization of uploaded file types. When an attacker crafts a malicious file and shares it via the Briefcase public sharing mechanism, the embedded JavaScript executes in the victim's browser session context when the file is opened, enabling arbitrary script execution, session hijacking, credential theft, and unauthorized actions on behalf of the victim. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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