CVE-2025-8133 in ChanCMS
Summary
by MITRE • 07/25/2025
A vulnerability classified as critical has been found in yanyutao0402 ChanCMS up to 3.1.2. This affects the function getArticle of the file app/modules/api/service/gather.js. The manipulation of the argument targetUrl leads to server-side request forgery. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.1.3 is able to address this issue. The identifier of the patch is 3ef58a50e8b3c427b03c8cf3c9e19a79aa809be6. It is recommended to upgrade the affected component.
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Analysis
by VulDB Data Team • 08/27/2025
This critical vulnerability in ChanCMS version 3.1.2 represents a severe server-side request forgery (SSRF) flaw that resides within the getArticle function of the api/service/gather.js module. The vulnerability stems from inadequate input validation of the targetUrl parameter, which allows attackers to manipulate the function's behavior and potentially access internal systems that should remain isolated from external networks. The flaw enables attackers to craft malicious requests that can traverse internal network boundaries, potentially exposing sensitive internal resources to unauthorized access.
The technical implementation of this vulnerability follows the classic SSRF attack pattern where the targetUrl argument is processed without proper sanitization or validation of the URL scheme and destination. This allows an attacker to specify arbitrary URLs including internal network addresses, loopback interfaces, or private network endpoints that should normally be inaccessible from the external interface. The vulnerability's remote exploitability means that an attacker does not require physical access to the network or system to leverage this flaw, making it particularly dangerous in publicly accessible web applications.
The operational impact of this vulnerability extends beyond simple information disclosure to potentially enable more sophisticated attacks such as internal network reconnaissance, service enumeration, and privilege escalation. Attackers could use this vulnerability to probe internal services, potentially identifying running applications, open ports, and system configurations that would otherwise remain hidden. The vulnerability also aligns with attack patterns documented in the MITRE ATT&CK framework under the technique T1190 - Proxy Relay, where attackers leverage compromised systems to access internal resources. The presence of a public exploit indicates that this vulnerability has already been weaponized by threat actors, increasing the urgency for remediation.
From a compliance and security standards perspective, this vulnerability directly relates to CWE-918 - Server-Side Request Forgery (SSRF) and falls under the broader category of insecure input handling practices. The issue represents a failure in proper access control mechanisms and input validation, which are fundamental requirements in secure application development as outlined in OWASP Top Ten and NIST Cybersecurity Framework. Organizations utilizing affected versions of ChanCMS face significant risk of data breaches, system compromise, and potential regulatory violations due to the exposure of internal network resources. The recommended mitigation strategy of upgrading to version 3.1.3 represents the most effective approach to address this vulnerability, as the patch (identified by commit hash 3ef58a50e8b3c427b03c8cf3c9e19a79aa809be6) specifically addresses the input validation weakness in the targetUrl parameter processing within the gather.js module.