Risk Letters

Exploited vulnerability

CVE-2020-7796

TLP:CLEAR

Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery vulnerability if WebEx zimlet installed and zimlet JSP is enabled.

Facts

  • Vendor: Synacor
  • Product: Zimbra Collaboration Suite
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 93.6 %
  • On CISA's Known Exploited Vulnerabilities list since: 17 February 2026
  • First known exploitation: 17 February 2026
  • CISA's deadline for US federal agencies: 10 March 2026
  • Weakness: CWE-918
  • First seen by Risk Letters: 17 February 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD