CVE-2022-27926 Synacor CVE debrief

Who should care

Administrators and security teams responsible for Synacor Zimbra Collaboration Suite (ZCS), especially any internet-facing or actively used deployments, should prioritize this issue because it is listed in CISA’s Known Exploited Vulnerabilities catalog.

Technical summary

The supplied records identify CVE-2022-27926 as a cross-site scripting vulnerability affecting Synacor Zimbra Collaboration Suite (ZCS). The CISA KEV entry includes the vendor’s required action: apply updates per vendor instructions. No CVSS score was provided in the supplied corpus.

Defensive priority

High priority. CISA added the issue to the Known Exploited Vulnerabilities catalog on 2023-04-03 and set a due date of 2023-04-24, so remediation should be scheduled immediately for affected systems.

Recommended defensive actions

• Apply vendor-recommended updates for Synacor Zimbra Collaboration Suite (ZCS) as directed in the vendor security center.
• Inventory ZCS instances to confirm which systems are affected and exposed.
• Prioritize remediation on internet-facing deployments and systems with broad user access.
• Verify patch status after remediation and monitor for any signs of abuse or unexpected browser-side behavior.
• Track CISA KEV and vendor advisories for any follow-up guidance or additional fixes.

Evidence notes

This debrief is based on the supplied CVE record, the CISA KEV source item, and the official CVE/NVD resource links. The KEV metadata names Synacor Zimbra Collaboration Suite (ZCS), identifies the issue as a cross-site scripting vulnerability, and states the required action is to apply updates per vendor instructions. The supplied timeline shows CVE publication and modification on 2023-04-03. No CVSS score was provided in the corpus.

Official resources