---
title: "CVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability"
url: https://erroneo.us/security/cve/CVE-2025-68645/
description: "CVE-2025-68645 (Synacor Zimbra Collaboration Suite (ZCS)): Exploited in the wild (CISA KEV). A Local File Inclusion (LFI) vulnerability exists in the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-12-22
date_modified: 2026-02-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-68645"
kev: true
cvss: 8.8
epss: 0.48873
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Synacor Zimbra Collaboration Suite (ZCS). CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-01-22, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-02-12 ; treat that as the outer limit, not the target.
- EPSS 48.9% , percentile 99: FIRST’s model estimates a 48.9% chance of exploitation activity in the next 30 days, higher than 99% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

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.

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-01-22; federal due date 2026-02-12. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 48.87% probability of exploitation activity in the next 30 days; percentile 99.

## Sources

- [Listed in CISA KEV notes (wiki.zimbra.com)](https://wiki.zimbra.com/wiki/Security_Center)
- [CVE.org record CVE-2025-68645](https://www.cve.org/CVERecord?id=CVE-2025-68645)
- [NVD entry CVE-2025-68645](https://nvd.nist.gov/vuln/detail/CVE-2025-68645)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-68645)
- [wiki.zimbra.com](https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy)

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Source page: https://erroneo.us/security/cve/CVE-2025-68645/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt