Risk Letters

Exploited vulnerability

CVE-2025-68645

TLP:CLEAR

Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) contains a PHP remote file inclusion vulnerability that could allow for remote attackers to craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.

Facts

  • Vendor: Synacor
  • Product: Zimbra Collaboration Suite (ZCS)
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 48.9 %
  • On CISA's Known Exploited Vulnerabilities list since: 22 January 2026
  • First known exploitation: 22 January 2026
  • CISA's deadline for US federal agencies: 12 February 2026
  • Weakness: CWE-98
  • First seen by Risk Letters: 22 January 2026

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