CVE-2026-93633

Zimbra Collaboration Suite (ZCS) versions 10.1.16 and 10.1.20 are vulnerable to a CSS sanitization bypass within the Briefcase component. The root cause is that the DefangFilter appends the final ASCII segment of a stylesheet containing non-ASCII characters without proper sanitization. This allow...

EUVD-2026-108973

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 fin...

PT-2026-122114

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 fin...