CVE-2025-68645
Actively exploited. CVE-2025-68645 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-22) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2025-68645 is indexed in GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- The vulnerability allows remote attackers to include arbitrary files from the WebRoot directory via crafted requests.
- Who is affected
- Deployments of Synacor Zimbra Collaboration Suite (ZCS) are affected.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Update to the patched version of ZCS as soon as possible.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 98% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2025-68645 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerabilitycisa-kev · 2026-01-22
External references
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[](https://www.csirts.com/cve/CVE-2025-68645)