CVE-2026-1105 is a remote SQL injection vulnerability identified in EasyCMS versions 1.0 through 1.6, specifically in the /UserAction.class.php file. The vulnerability arises from improper sanitization of the _order argument, which attackers can manipulate to inject arbitrary SQL commands. This injection flaw allows unauthenticated attackers to execute SQL queries remotely, potentially leading to unauthorized data access, data modification, or denial of service. The vulnerability does not require any user interaction or privileges, making exploitation straightforward. The CVSS 4.0 score of 6.9 reflects a medium severity, considering the network attack vector, low complexity, and no required authentication, but limited impact on confidentiality, integrity, and availability. Although no known active exploitation has been reported, a public exploit exists, increasing the likelihood of future attacks. The vendor has not issued any patches or advisories, leaving users exposed. The lack of vendor response suggests organizations must take independent action to secure their EasyCMS deployments. The vulnerability's presence in a widely used CMS component increases the attack surface for web applications relying on EasyCMS, especially those with public internet exposure.

For European organizations, exploitation of this SQL injection vulnerability could lead to unauthorized access to sensitive data stored within EasyCMS databases, including user information, content management data, and potentially administrative credentials. Data integrity could be compromised by unauthorized modification or deletion of records, disrupting business operations or defacing websites. Availability impacts may occur if attackers execute commands that cause database errors or service crashes. Given EasyCMS’s role in content management, affected organizations may face reputational damage, regulatory compliance issues (e.g., GDPR breaches), and financial losses. Public-facing EasyCMS instances in sectors such as government, education, and media are particularly at risk. The absence of vendor patches increases the urgency for organizations to implement mitigations. The availability of public exploits raises the risk of automated scanning and exploitation campaigns targeting European infrastructure.

European organizations should immediately audit their EasyCMS installations to identify affected versions (1.0 to 1.6). Since no official patches are available, organizations must implement manual mitigations: (1) Review and sanitize all inputs, especially the _order parameter in /UserAction.class.php, using strict whitelisting of allowed values or parameterized queries to prevent SQL injection. (2) Employ Web Application Firewalls (WAFs) configured with rules to detect and block SQL injection attempts targeting EasyCMS. (3) Restrict access to the CMS administration interface by IP whitelisting or VPN-only access to reduce exposure. (4) Monitor logs for suspicious query patterns or repeated access attempts to the vulnerable parameter. (5) Consider upgrading or migrating to a CMS platform with active security support if feasible. (6) Conduct regular security assessments and penetration tests focusing on injection flaws. (7) Educate development and IT teams about secure coding practices and the risks of unsanitized inputs. These steps will reduce the risk until an official patch or vendor guidance becomes available.