CVE-2025-68645 is a Local File Inclusion vulnerability affecting Zimbra Collaboration Suite (ZCS) versions 10.0 and 10.1, specifically within the Webmail Classic UI component. The vulnerability stems from insufficient validation of user-supplied request parameters processed by the RestFilter servlet at the /h/rest endpoint. An unauthenticated remote attacker can exploit this flaw by crafting specially designed HTTP requests that manipulate internal request dispatching mechanisms. This manipulation allows the attacker to include arbitrary files from the WebRoot directory on the server. The inclusion of arbitrary files can lead to disclosure of sensitive information such as configuration files, credentials, or source code, and may facilitate further attacks like remote code execution if combined with other vulnerabilities. The CVSS v3.1 base score is 8.8, indicating a high severity with network attack vector, low attack complexity, no privileges required, but requiring user interaction. The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), highlighting the root cause as improper input validation. No patches or official fixes are currently listed, and no known exploits have been reported in the wild as of the publication date. However, the risk remains significant due to the ease of exploitation and potential impact on confidentiality, integrity, and availability of affected systems.

The impact of CVE-2025-68645 on organizations worldwide can be severe. Successful exploitation can lead to unauthorized disclosure of sensitive files residing in the WebRoot directory, including configuration files, user data, or credentials, compromising confidentiality. Attackers may leverage this information to escalate privileges, conduct further attacks, or disrupt services, affecting integrity and availability. Since the vulnerability requires no authentication and can be exploited remotely, it broadens the attack surface significantly. Organizations relying on Zimbra Collaboration Suite for email and collaboration services, especially in sectors handling sensitive communications such as government, finance, healthcare, and education, face heightened risks. Data breaches resulting from this vulnerability could lead to regulatory penalties, reputational damage, and operational disruptions. The absence of known exploits currently provides a window for proactive mitigation, but the high CVSS score underscores the urgency for remediation.

To mitigate CVE-2025-68645 effectively, organizations should: 1) Monitor Zimbra official channels for patches or security advisories and apply updates promptly once available. 2) Implement strict input validation and sanitization on all user-supplied parameters, particularly those handled by the RestFilter servlet and the /h/rest endpoint, to prevent malicious request manipulation. 3) Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the vulnerable endpoint, focusing on patterns indicative of LFI attempts. 4) Restrict access to the WebRoot directory and sensitive files using proper file system permissions and server configuration to minimize exposure. 5) Conduct regular security assessments and penetration testing focused on webmail interfaces and REST endpoints to identify similar vulnerabilities. 6) Enable detailed logging and monitoring of web server requests to detect anomalous activities early. 7) Consider isolating or segmenting the Zimbra server within the network to limit potential lateral movement if compromised. These targeted actions go beyond generic advice by focusing on the specific vulnerable components and attack vectors associated with this LFI.