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[ CVE-2025-68645 · Published 22 Dec 2025 ]

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

Exploited · CISA KEV CVSS 8.8 EPSS 49%No fix listed yet

[ Why it matters ]Priority signals

  • Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-01-22
  • EPSS: 49% chance of exploitation in the next 30 days (higher than 99% of CVEs)

[ Description ]Official description

A Local File Inclusion (LFI) vulnerability exists in the Webmail Classic UI of Zimbra Collaboration (ZCS) 10.0 and 10.1 because of improper handling of user-supplied request parameters in the RestFilter servlet. An unauthenticated remote attacker can craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.

CISA: 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.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 12 Feb 2026): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References