CVE-2023-34192: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

CVE-2023-34192 · Severity: critical · CVSS 9 · Exploited in the wild · Published 2025-02-25

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability in the /h/autoSaveDraft function. A remote authenticated attacker can exploit this by sending a crafted script, potentially leading to arbitrary code execution in the context of the user's session.

Technologies: Synacor Zimbra Collaboration Suite (ZCS). Vendors: Synacor.

Quick answers

Is CVE-2023-34192 exploited in the wild?
Yes. CVE-2023-34192 is known to be exploited in the wild, first recorded on 25 February 2025. Treat it as urgent.
How severe is CVE-2023-34192?
Critical severity, with a CVSS score of 9, published 25 February 2025.
Which products and versions are affected?
Synacor Zimbra Collaboration Suite (ZCS) 8.8.15 up to patch 30.
Is there a fix for CVE-2023-34192?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-34192 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-34192?
Check whether you run Synacor Zimbra Collaboration Suite (ZCS). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Synacor Zimbra Collaboration Suite (ZCS) 8.8.15 up to patch 30

Timeline

  • 2025-02-25: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2025-02-25: disclosed

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