Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2026-01-22. This indicates confirmed attacks in production environments.
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.
CVE-2025-68645
HighCVSS 8.8KEVSummary
A Local File Inclusion (LFI) vulnerability exists in the Webmail Classic UI of Zimbra Collaboration (ZCS) 10.0 and 10.1 due to 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.
Risk Assessment
An unauthenticated attacker can read arbitrary files from the WebRoot directory of the Zimbra server, potentially exposing sensitive information and facilitating further attacks on the organization's mail environment.
Recommendation
Update Zimbra Collaboration to a version containing the fix for CVE-2025-68645 as soon as possible and restrict access to the /h/rest endpoint from untrusted networks.
Other vulnerabilities in Zimbra Collaboration
See all- CVE-2016-4019High
Unspecified vulnerability in Zimbra Collaboration before version 8.7.0 allows remote attackers to affect integrity via unknown vectors.
- CVE-2016-3413High
Unspecified vulnerability in Zimbra Collaboration before 8.7.0 allows remote attackers to affect integrity via unknown vectors.
- CVE-2016-3406High
Multiple cross-site request forgery (CSRF) vulnerabilities in Zimbra Collaboration before version 8.7.0 allow remote attackers to hijack the authentication of unspecified victims via vectors involving the Client uploader extension or extension REST handlers.
- CVE-2016-3405High
Multiple unspecified vulnerabilities in Zimbra Collaboration before version 8.7.0 allow remote attackers to affect integrity.
- CVE-2016-3404High
Unspecified vulnerability in Zimbra Collaboration before 8.7.0 allows remote attackers to affect integrity via unknown vectors.
- CVE-2016-3402High
Unspecified vulnerability in Zimbra Collaboration before version 8.7.0 allows remote attackers to affect confidentiality via unknown vectors.
- CVE-2026-73570HighActively exploited
A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.
- CVE-2025-48700MediumActively exploited
A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session. It arises from insufficient sanitization of HTML content, including crafted tag structures and attribute values with an @import directive. The vulnerability triggers when a user views a crafted email in the Classic UI, requiring no additional interaction.
- CVE-2022-27924HighActively exploited
Zimbra Collaboration (ZCS) 8.8.15 and 9.0 allows an unauthenticated attacker to inject arbitrary memcache commands into a targeted instance. These memcache commands become unescaped, causing an overwrite of arbitrary cached entries.
- CVE-2016-3415Critical
Zimbra Collaboration before version 8.7.0 allows remote attackers to conduct deserialization attacks via unspecified vectors.
Original NVD description (English source)
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.