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PatchSiren cyber security CVE debrief

CVE-2022-27926 Synacor CVE debrief

CVE-2022-27926 is a cross-site scripting (XSS) vulnerability in Synacor Zimbra Collaboration Suite (ZCS). CISA added it to the Known Exploited Vulnerabilities catalog on 2023-04-03 and set a remediation due date of 2023-04-24, indicating it should be treated as a high-priority remediation item for exposed ZCS environments.

Vendor
Synacor
Product
Zimbra Collaboration Suite (ZCS)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-04-03
Original CVE updated
2023-04-03
Advisory published
2023-04-03
Advisory updated
2023-04-03

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-27926 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-27926

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2022-27926 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-27926

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.