CVE-2025-11902 identifies a SQL injection vulnerability in the ChanCMS content management system developed by yanyutao0402, affecting versions 3.3.0 through 3.3.2. The flaw exists in the findField function located at the /cms/article/findField endpoint, where the 'cid' parameter is not properly sanitized before being used in SQL queries. This allows remote attackers to craft malicious input that manipulates the SQL query logic, potentially exposing or altering sensitive database information. The vulnerability requires no authentication or user interaction, making it easier to exploit remotely. The vendor was notified early but has not issued any patches or advisories, and public exploit code is available, increasing the likelihood of exploitation. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the vulnerability's moderate impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. The vulnerability does not involve scope change or security controls bypass but can lead to partial data compromise. No official patches or mitigations have been released, leaving users dependent on external protective measures.

The SQL injection vulnerability in ChanCMS can have significant consequences for organizations relying on this CMS. Exploitation can lead to unauthorized access to sensitive data stored in the backend database, including user information, content, and configuration data. Attackers may also modify or delete data, potentially disrupting website functionality or defacing content. The ability to execute arbitrary SQL commands remotely without authentication increases the risk of automated attacks and data breaches. Organizations may face reputational damage, regulatory penalties, and operational disruptions. Since the vendor has not responded or provided patches, the risk remains unmitigated, potentially leading to widespread exploitation if attackers target vulnerable ChanCMS installations. The medium severity rating suggests moderate but non-critical impact, yet the ease of exploitation and public availability of exploits elevate the threat level. Industries with public-facing websites using ChanCMS, especially those handling sensitive or regulated data, are particularly vulnerable.

Given the absence of official patches, organizations should implement immediate compensating controls. First, apply strict input validation and sanitization on the 'cid' parameter at the web application or reverse proxy level to block malicious SQL payloads. Deploy a Web Application Firewall (WAF) with custom rules targeting SQL injection patterns specific to ChanCMS's findField endpoint. Monitor database query logs for unusual or unexpected queries that may indicate exploitation attempts. Restrict database user permissions to the minimum necessary to limit the impact of successful injection. Consider isolating the CMS environment and limiting network exposure to reduce attack surface. If feasible, upgrade to a newer, unaffected CMS version once available or migrate to alternative CMS platforms with active security support. Regularly back up CMS data and test restoration procedures to mitigate data loss risks. Stay alert for vendor updates or community patches and apply them promptly. Conduct security assessments and penetration tests focusing on SQL injection vectors in ChanCMS deployments.