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CVE-2026-93633

5.4 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 11

  1. Cpes+1 CPE criteria (now 1)NVD modified 2026-10-28 21:24
  2. StatusPublished → AnalyzedNVD modified 2026-10-28 21:24
  3. StatusUndergoing Analysis → PublishedNVD modified 2026-10-28 19:51
  4. StatusPublished → Undergoing AnalysisNVD modified 2026-10-28 20:18
  5. StatusUndergoing Analysis → PublishedNVD modified 2026-10-28 19:51
  6. StatusPublished → Undergoing AnalysisNVD modified 2026-10-28 20:18
  7. StatusAwaiting Analysis → PublishedNVD modified 2026-10-23 13:25
  8. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
  9. StatusReceived → PublishedNVD modified 2026-10-23 13:25
  10. StatusPublished → ReceivedNVD modified 2026-10-23 14:17
  11. First seenCVSS 5.4 · zimbraNVD modified 2026-10-23 13:25

Affected (CPE criteria) 1

  • cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

References 2