CVE-2025-51653 is a SQL injection vulnerability identified in SemCms version 5.0, specifically exploitable via the 'pid' parameter in the SEMCMS_ct.php script. SQL injection vulnerabilities occur when user-supplied input is improperly sanitized and directly incorporated into SQL queries, allowing an attacker to manipulate the database query logic. In this case, the 'pid' parameter is vulnerable, meaning an attacker could craft malicious input to execute arbitrary SQL commands against the backend database. This could lead to unauthorized data access, data modification, or even complete compromise of the database server depending on the privileges of the database user. The vulnerability was reserved on June 16, 2025, and published on July 14, 2025. There is no CVSS score assigned yet, and no known exploits have been reported in the wild. The lack of patch links suggests that a fix may not have been publicly released at the time of this report. SemCms is a content management system, and such platforms are often used by organizations to manage website content and data. The vulnerability in a core script handling content parameters could be widely exploitable if the system is internet-facing and not properly protected. The absence of authentication requirements or user interaction details means the attack vector could be direct HTTP requests to the vulnerable endpoint. Given the nature of SQL injection, the attacker could potentially extract sensitive information, modify or delete data, or escalate privileges within the application or database environment.

For European organizations using SemCms v5.0, this vulnerability poses significant risks to the confidentiality, integrity, and availability of their data and web services. Exploitation could lead to unauthorized disclosure of sensitive customer or business data stored in the CMS database, potentially violating GDPR and other data protection regulations. Data tampering or deletion could disrupt business operations, damage reputation, and incur financial losses. Since SemCms is a CMS, many organizations may use it to manage public-facing websites, increasing the risk of public data exposure or defacement. The absence of known exploits currently reduces immediate risk, but the publication of this vulnerability may prompt attackers to develop exploits rapidly. European organizations with limited security monitoring or patch management processes may be particularly vulnerable. Additionally, regulatory scrutiny in Europe means that any data breach resulting from this vulnerability could lead to significant compliance penalties and legal consequences.

Organizations should immediately audit their use of SemCms to determine if version 5.0 is deployed and exposed to the internet. If so, they should implement the following specific mitigations: 1) Apply any vendor-provided patches or updates as soon as they become available. 2) If no patch exists, implement web application firewall (WAF) rules to detect and block malicious SQL injection payloads targeting the 'pid' parameter in SEMCMS_ct.php. 3) Conduct input validation and sanitization on the 'pid' parameter to ensure only expected numeric or alphanumeric values are accepted, rejecting any suspicious input patterns. 4) Restrict database user privileges associated with the CMS to the minimum necessary, preventing unauthorized data manipulation or extraction. 5) Monitor web server and database logs for unusual query patterns or error messages indicative of attempted SQL injection. 6) Consider isolating or temporarily disabling the vulnerable functionality if immediate patching is not feasible. 7) Educate development and security teams about secure coding practices to prevent similar vulnerabilities in the future. These targeted actions go beyond generic advice by focusing on the specific vulnerable parameter and the CMS context.