High severity · published Dec 22, 2025
CVE-2025-68645
Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
In wildKEV
8.8
CVSS
48.9%
EPSS
Yes
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)48.9% · higher than 99% of CVEs
Exploited in the wildYes
CISA KEVListed Jan 22, 2026
Federal remediation dueFeb 12, 2026
Ransomware campaign useNot known
Affected products
Which versions
ZC
Zimbra Collaboration Suite · Synacor
10.0.0 before 10.0.18; 10.1.0 before 10.1.13 · source: NVD
ZC
Zimbra Collaboration Suite (ZCS) · Synacor
All versions, or not specified · source: KEV
In the news
VulnerabilityHigh
[CISA KEV] CVE-2025-68645: Synacor Zimbra Collaboration Suite (ZCS) - Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
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.
ZC Zimbra Collaboration Suite (ZCS)CVE-2025-68645
Jan 22, 2026·CISA KEV
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-68645
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-68645
CISA KEV catalogue
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
wiki.zimbra.com
https://wiki.zimbra.com/wiki/Security_Center
wiki.zimbra.com
https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy
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