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CVE-2025-68645

8.8, high Known exploited

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

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
49% higher than 98.8% of scored CVEs
Exploitation
Confirmed in the wild
Published
22 Dec 20259 months ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 22 Jan 2026. US federal agencies had to remediate by 12 Feb 2026, a deadline that has passed.

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.

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.

Details

Vendor
Synacor
Product
Zimbra Collaboration Suite
Weakness
CWE-98 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve@mitre.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References 3

Advisories 1

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Synacor CVEs

Every Synacor CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-73570 Zimbra Collaboration Suite (ZCS) OS Command Injection Vulnerability KEV EPSS 72% 8.9, high
  • CVE-2025-66376 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability KEV EPSS 20% 6.1, medium
  • CVE-2025-48700 Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability KEV EPSS 2% 6.1, medium
  • CVE-2025-27915 Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability KEV EPSS 4% 5.4, medium
  • CVE-2024-45519 Synacor Zimbra Collaboration Suite (ZCS) Command Execution Vulnerability KEV EPSS 100% 9.8, critical
  • CVE-2024-27443 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability KEV EPSS 25% 6.1, medium
  • CVE-2023-37580 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability KEV EPSS 49% 6.1, medium
  • CVE-2023-34192 Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability KEV EPSS 77% 9, critical

Beyond this page

Is CVE-2025-68645 in your network?

This page tells you how dangerous CVE-2025-68645 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2025-68645 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2025-68645 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.