Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability (CVE-2023-34192)
Severity: critical · Patch status: unknown · Since 2025-02-25 · CVE-2023-34192
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. CISA added CVE-2023-34192 to its Known Exploited Vulnerabilities catalog on Feb 25, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Mar 18, 2025 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch