CVE-2025-68645 in Zimbra Collaboration Suite
Summary
by MITRE • 12/22/2025
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.
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Analysis
by VulDB Data Team • 01/22/2026
The vulnerability CVE-2025-68645 represents a critical local file inclusion flaw in Zimbra Collaboration Suite versions 10.0 and 10.1, specifically within the Webmail Classic UI component. This issue stems from inadequate validation of user-supplied input parameters within the RestFilter servlet, which processes requests to the /h/rest endpoint. The flaw allows attackers to manipulate internal request routing mechanisms by crafting specially crafted requests that can lead to arbitrary file inclusion from the WebRoot directory. The vulnerability affects the core webmail functionality and represents a significant security risk for organizations relying on Zimbra's email infrastructure.
The technical implementation of this vulnerability resides in the improper sanitization and validation of request parameters within the RestFilter servlet. When user input reaches the servlet, the application fails to properly validate or sanitize the incoming parameters before using them to determine internal file paths or request dispatching logic. This improper handling creates a path traversal condition where attacker-controlled input can influence the application's internal behavior to include files from the web root directory. The vulnerability specifically targets the /h/rest endpoint which serves as a critical interface for webmail functionality and REST API operations. The flaw enables an attacker to bypass normal access controls and potentially access sensitive files that should remain protected within the application's file system.
The operational impact of CVE-2025-68645 is severe and multifaceted for affected organizations. An unauthenticated remote attacker can exploit this vulnerability to access arbitrary files on the server, potentially including configuration files, credential stores, application logs, and other sensitive data. The ability to include files from the WebRoot directory means that attackers can potentially access web application source code, database connection strings, and other critical system information. This vulnerability can lead to complete system compromise, data exfiltration, and further lateral movement within the network. Organizations using Zimbra Collaboration Suite 10.0 and 10.1 are particularly at risk as this vulnerability affects the core webmail interface that many users interact with daily.
Mitigation strategies for CVE-2025-68645 should prioritize immediate patching of affected Zimbra Collaboration Suite versions to the latest security releases. Organizations should implement network-level restrictions to limit access to the /h/rest endpoint and other vulnerable interfaces. Input validation and sanitization measures should be strengthened at the application level, particularly within the RestFilter servlet to ensure that all user-supplied parameters are properly validated before being used in file operations. Security monitoring should be enhanced to detect unusual patterns of requests to the vulnerable endpoint, and access controls should be reviewed to minimize the attack surface. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to help prevent exploitation attempts. This vulnerability aligns with CWE-22 Path Traversal and CWE-94 Code Injection categories, and represents a technique that could be leveraged by threat actors following ATT&CK tactics including T1566 Initial Access and T1078 Valid Accounts for privilege escalation.