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CVE-2026-93631

7.1 high SSVC exploitation: none Analyzed
NVD · CVE.org

A cross-site request forgery vulnerability in the OAuth extension of Zimbra Collaboration Suite (ZCS) Network Edition allows an attacker to link an attacker-controlled external account to a victim's mailbox. The OAuth callback does not bind its state value or authorization code to the initiating Zimbra session and instead selects the destination mailbox from the browser's current authentication cookie. On a deployment with the provider configured, an attacker can induce a signed-in victim to load a callback containing a fresh code for the attacker's provider account. This creates a persistent data source that imports attacker-controlled contacts or events. With bidirectional CalDAV synchronization, appointments subsequently created or edited in the linked calendar are also disclosed to the attacker. 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 21:27
  2. StatusPublished → AnalyzedNVD modified 2026-10-28 21:27
  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 13:23
  8. StatusPublished → Awaiting AnalysisNVD modified 2026-10-23 16:44
  9. StatusReceived → PublishedNVD modified 2026-10-23 13:23
  10. StatusPublished → ReceivedNVD modified 2026-10-23 14:17
  11. First seenCVSS 7.1 · zimbraNVD modified 2026-10-23 13:23

Affected (CPE criteria) 1

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

References 2