Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
n/a — n/a
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.
8.8
31.8%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Published
- Dec 22, 2025
- Modified
- Feb 26, 2026
- Added to KEV
- Jan 22, 2026
- Federal patch due
- Feb 12, 2026
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2025-68645, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2025-68645 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2025-68645?
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.
How severe is CVE-2025-68645?
CVE-2025-68645 has a CVSS base score of 8.8 out of 10 (CVSS 3.1).
Is CVE-2025-68645 actively exploited in the wild?
Yes. CVE-2025-68645 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jan 22, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2025-68645?
31.8% - meaning FIRST.org's EPSS model estimates a 31.8% probability this vulnerability will be exploited in the wild within 30 days (98% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2025-68645?
Yes - a public Nuclei template referencing CVE-2025-68645 exist in public repositories we checked.
What type of vulnerability is CVE-2025-68645?
CVE-2025-68645 is classified under CWE-98 (CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')).
Cross-checked against
Impactr finds and proves whether CVE-2025-68645 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
Join the waitlist