CVE-2026-1552 is a SQL injection vulnerability identified in SEMCMS version 5.0, specifically in the /SEMCMS_Info.php file. The vulnerability is triggered by manipulation of the 'searchml' parameter, which is not properly sanitized before being used in SQL queries. This flaw allows remote attackers to inject arbitrary SQL code, potentially leading to unauthorized data access, modification, or deletion. The attack vector is network-based, requiring no authentication or user interaction, which increases the risk profile. The vulnerability was disclosed publicly on January 29, 2026, and although the vendor was notified early, no patch or response has been issued. The CVSS 4.0 score of 5.3 reflects a medium severity, considering the low attack complexity and no required privileges, but limited impact on confidentiality, integrity, and availability. No known exploits are currently observed in the wild, but public exploit information exists, which could facilitate attacks. The lack of vendor response and patch availability necessitates that organizations implement their own mitigations. This vulnerability could be exploited to extract sensitive information, alter database contents, or disrupt service availability, depending on the database privileges of the SEMCMS application. The absence of security controls like input validation or parameterized queries in the affected code is the root cause.

For European organizations using SEMCMS 5.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of their data. Successful exploitation could lead to unauthorized disclosure of sensitive information, data tampering, or denial of service conditions. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that rely on SEMCMS for content management may face operational disruptions and reputational damage. The medium severity score indicates a moderate but tangible threat, especially given the remote exploitation capability without authentication. The public availability of exploit details increases the likelihood of opportunistic attacks. Additionally, the vendor's lack of response and absence of patches mean organizations must rely on internal security measures. Failure to address this vulnerability could result in regulatory non-compliance under GDPR if personal data is compromised, leading to legal and financial consequences.

European organizations should immediately implement input validation and sanitization for the 'searchml' parameter to prevent injection of malicious SQL code. Employing parameterized queries or prepared statements in the SEMCMS codebase will effectively mitigate the risk. If source code modification is not feasible, deploying Web Application Firewalls (WAFs) with specific rules to detect and block SQL injection patterns targeting 'searchml' can provide interim protection. Regularly monitoring database logs for unusual queries or access patterns is essential to detect exploitation attempts early. Organizations should also isolate SEMCMS instances within segmented network zones to limit potential lateral movement. Given the lack of vendor patches, consider upgrading to newer SEMCMS versions if available or migrating to alternative CMS platforms with active security support. Finally, conduct security awareness training for administrators to recognize and respond to potential exploitation indicators.