Remote File Inclusion in Synacor Zimbra Collaboration Suite (CVE‑2025‑68645) Enables Arbitrary File Access
What It Is – Synacor Zimbra Collaboration Suite (ZCS) contains a PHP Remote File Inclusion (RFI) flaw in the /h/rest endpoint. An attacker can craft a request that forces the server to include arbitrary files from the WebRoot directory, potentially leading to code execution or data disclosure.
Exploitability – The vulnerability is exploitable over the network without authentication. No public exploit code has been released, but the CVSS base score is 8.6 (High), indicating a serious risk.
Affected Products – Synacor Zimbra Collaboration Suite (all supported versions that expose the /h/rest endpoint).
Why It Matters for Trust & Control Assurance
- Vulnerability Management – Demonstrates the need for continuous scanning and timely remediation to satisfy control objectives around secure configuration and application hardening.
- Audit Evidence – Patch deployment and verification logs become defensible evidence for auditors assessing control effectiveness across frameworks (e.g., NIST CSF, ISO 27001).
- Supply‑Chain Assurance – Organizations that rely on Zimbra as a core communication platform must prove due diligence in monitoring third‑party software for critical flaws.
Recommended Actions
- Apply the vendor‑released patch for CVE‑2025‑68645 immediately.
- Conduct a targeted scan of all Zimbra instances to confirm the vulnerability is closed.
- Enable web‑application firewall (WAF) rules to block unexpected
/h/restrequests. - Capture remediation evidence (patch logs, scan reports) in your control repository for audit readiness.
Source: CISA KEV – CVE‑2025‑68645