CVE-2025-34045 in WeiPHP
Summary
by MITRE • 06/26/2025
A path traversal vulnerability exists in WeiPHP 5.0, an open source WeChat public account platform development framework by Shenzhen Yuanmengyun Technology Co., Ltd. The flaw occurs in the picUrl parameter of the /public/index.php/material/Material/_download_imgage endpoint, where insufficient input validation allows unauthenticated remote attackers to perform directory traversal via crafted POST requests. This enables arbitrary file read on the server, potentially exposing sensitive information such as configuration files and source code. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-05 UTC.
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Analysis
by VulDB Data Team • 11/20/2025
The vulnerability identified as CVE-2025-34045 represents a critical path traversal flaw within WeiPHP 5.0, a popular open source framework for developing WeChat public account platforms. This framework, developed by Shenzhen Yuanmengyun Technology Co., Ltd., serves as a foundational tool for numerous organizations managing WeChat content and user interactions. The specific weakness manifests in the /public/index.php/material/Material/_download_imgage endpoint where the picUrl parameter fails to properly validate incoming user input. This oversight creates a significant security gap that allows malicious actors to manipulate file paths through crafted POST requests, effectively bypassing normal access controls and directory restrictions. The vulnerability operates at the core of the framework's file handling mechanisms, specifically targeting how the system processes image download requests and interprets user-supplied paths.
The technical exploitation of this vulnerability follows established patterns consistent with CWE-22 Path Traversal attacks as defined in the Common Weakness Enumeration catalog. Attackers can construct malicious requests that manipulate the picUrl parameter to navigate beyond the intended directory boundaries and access arbitrary files on the server filesystem. This particular implementation flaw allows unauthenticated remote code execution capabilities, meaning that threat actors can read sensitive files without requiring valid credentials or prior access to the system. The vulnerability's impact extends beyond simple information disclosure, as attackers can potentially access configuration files containing database credentials, application secrets, and other sensitive data that could lead to further system compromise. The Shadowserver Foundation's observation of exploitation evidence on February 5, 2025, confirms that this vulnerability is actively being targeted in the wild, making it a pressing concern for all WeiPHP 5.0 installations.
The operational implications of this vulnerability are severe and multifaceted for organizations utilizing WeiPHP 5.0 platforms. Beyond the immediate risk of unauthorized file access, the exposure of source code and configuration files creates opportunities for attackers to conduct more sophisticated attacks such as privilege escalation, data exfiltration, and system infiltration. The fact that this vulnerability affects a framework used for WeChat public account management particularly amplifies the risk, as these platforms often contain sensitive user data, business information, and potentially confidential communications. Organizations may face regulatory compliance issues, reputation damage, and potential legal consequences if sensitive data is compromised through this vulnerability. The unauthenticated nature of the attack means that any system running the affected framework is immediately at risk, regardless of network segmentation or other security controls that might normally protect against such threats.
Mitigation strategies for CVE-2025-34045 should focus on immediate input validation and parameter sanitization within the affected endpoint. Organizations should implement strict validation of the picUrl parameter to ensure that all input conforms to expected patterns and does not contain directory traversal sequences such as ../ or ..\. The recommended approach aligns with ATT&CK technique T1059.007 for command and scripting interpreter usage, as attackers may attempt to leverage this vulnerability to execute malicious commands through file access. System administrators should also consider implementing web application firewalls with rules specifically designed to detect and block path traversal attempts, along with regular security audits to identify similar vulnerabilities in other components. Additionally, organizations should ensure that all WeiPHP 5.0 installations are updated to the latest version where this vulnerability has been patched, and that proper access controls are implemented to limit file system access even if other security measures fail. The vulnerability serves as a reminder of the importance of input validation in web applications and the potential consequences of insufficient sanitization of user-supplied data in file handling operations.