CVE-2026-93633

A CSS sanitization vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user with Briefcase access to publish a document that displays attacker-controlled content under the Zimbra origin. When processing a stylesheet containing non-ASCII characters, DefangFilter appends the final ASCII segment without sanitizing it. HTML stored as application/x-zimbra-doc can therefore retain CSS URL references that the normal sanitizer removes. An attacker can share a crafted document that loads external resources and displays a credential-collection form using Zimbra's own visual assets. Exploitation requires the victim to open the document in a browser that renders the content type inline; credential theft additionally requires form submission. ZCS 10.1.16 and 10.1.20 are affected.

• https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
• https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/

• MEDIUMCVE-2012-20003PoC
• MEDIUMCVE-2012-20004PoC
• MEDIUMCVE-2012-20005PoC
• MEDIUMCVE-2014-125131PoC
• MEDIUMCVE-2014-125132PoC
• MEDIUMCVE-2016-20098PoC
• MEDIUMCVE-2016-20102PoC
• MEDIUMCVE-2017-20288PoC

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