CVE-2025-11905 is a code injection vulnerability identified in the ChanCMS content management system, versions 3.3.0 through 3.3.2. The vulnerability resides in the getArticle function within the gather.js controller module, which improperly handles input parameters, allowing an attacker to inject malicious code remotely. This injection can lead to arbitrary code execution on the server hosting ChanCMS, potentially compromising the system's confidentiality, integrity, and availability. The attack vector is network-based with no user interaction required, and the attack complexity is low, though some privileges are necessary. The vendor was notified early but has not issued a patch or response, and public exploit code is available, increasing the risk of exploitation. The vulnerability does not require authentication, making it accessible to unauthenticated remote attackers. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact and exploitability. The lack of vendor response and absence of patches necessitate immediate defensive actions by users of ChanCMS. This vulnerability could be leveraged to execute arbitrary commands, deface websites, steal sensitive data, or pivot within the network, posing a significant threat to organizations relying on this CMS for web content delivery.

For European organizations, exploitation of CVE-2025-11905 could lead to unauthorized code execution on web servers running ChanCMS, resulting in data breaches, website defacement, or service disruption. Given that many organizations use CMS platforms to manage public-facing websites and internal portals, a successful attack could compromise sensitive customer or operational data, damage reputation, and cause regulatory compliance issues under GDPR. The medium severity score indicates a moderate but tangible risk, especially since the vulnerability can be exploited remotely without user interaction. Organizations with internet-exposed ChanCMS instances are particularly vulnerable. The absence of vendor patches increases the risk of exploitation by opportunistic attackers or automated scanning tools. The impact could extend to supply chain risks if compromised CMS servers are used to distribute malicious content or malware. Additionally, the vulnerability could be exploited to establish persistent footholds within networks, facilitating further attacks.

Since no official patch is currently available, European organizations should immediately audit their ChanCMS deployments to identify affected versions (3.3.0 to 3.3.2). They should restrict network access to the CMS backend, ideally limiting it to trusted IP addresses or VPNs. Implementing Web Application Firewall (WAF) rules to detect and block suspicious input patterns targeting the getArticle function can reduce exploitation risk. Conduct thorough input validation and sanitization on all user-supplied data related to article retrieval. Consider temporarily disabling or isolating the gather.js module if feasible. Monitor web server logs and intrusion detection systems for exploitation attempts or anomalous behavior. Organizations should prepare for rapid patch deployment once the vendor releases a fix or consider migrating to alternative CMS platforms with active security support. Regular backups and incident response plans should be updated to address potential compromise scenarios. Collaboration with cybersecurity communities and threat intelligence sharing can provide early warnings of exploitation trends.