ClosedCriticalPatched

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

Synacor Zimbra Collaboration Suite (ZCS)

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function. Added to CISA KEV on 2025-02-25.

Why this severity: CVSS 9.0 (CISA ADP, v3.1); actively exploited (CISA KEV)

Started: Feb 25, 2025
Closed: Feb 25, 2025
CVE: CVE-2023-34192

Follow this incident

Updated Feb 25, 2025

Affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

Fixed in

See vendor advisory linked in sources

Timeline1

Feb 25, 2025
CISA added CVE-2023-34192 to the KEV catalog (due 2025-03-18).

Advisories3

Notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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