CVE-2025-51657 is a SQL injection vulnerability identified in SemCms version 5.0, specifically through the 'lgid' parameter in the SEMCMS_Link.php script. SQL injection vulnerabilities occur when user-supplied input is improperly sanitized before being included in SQL queries, allowing attackers to manipulate the database queries executed by the application. In this case, the 'lgid' parameter is vulnerable, meaning an attacker could craft malicious input to alter the intended SQL commands. This could lead to unauthorized data access, data modification, or even complete compromise of the backend database. Since SemCms is a content management system, exploitation of this vulnerability could allow attackers to extract sensitive information, modify website content, or escalate privileges within the application. The vulnerability was published on July 14, 2025, but no CVSS score or patch information is currently available, and there are no known exploits in the wild at this time. The lack of a CVSS score suggests the vulnerability is newly disclosed and may not yet have been fully assessed or mitigated. Given the nature of SQL injection, exploitation typically does not require authentication or user interaction, making it a high-risk issue if the system is exposed to untrusted users or the internet.

For European organizations using SemCms v5.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of their web applications and underlying databases. Successful exploitation could lead to unauthorized disclosure of sensitive data, including customer information, internal documents, or intellectual property. Data integrity could be compromised by unauthorized modifications or deletions, potentially damaging business operations or reputation. Availability might also be affected if attackers execute destructive queries or cause database errors. Organizations in sectors such as government, finance, healthcare, and e-commerce, which often rely on CMS platforms and handle sensitive data, could face regulatory repercussions under GDPR if personal data is exposed. Additionally, the absence of patches and known exploits suggests that organizations must proactively assess and mitigate this vulnerability to prevent future attacks. The impact is heightened if SemCms instances are internet-facing or lack additional security controls such as web application firewalls (WAFs).

Given the absence of an official patch, European organizations should immediately conduct a thorough security review of all SemCms v5.0 deployments. Specific mitigation steps include: 1) Implement input validation and parameterized queries or prepared statements in the SEMCMS_Link.php script to sanitize the 'lgid' parameter and prevent injection. 2) Employ a Web Application Firewall (WAF) with rules designed to detect and block SQL injection attempts targeting the vulnerable parameter. 3) Restrict access to the CMS backend and related scripts by IP whitelisting or VPN-only access to reduce exposure. 4) Conduct regular code audits and penetration testing focusing on injection vulnerabilities. 5) Monitor logs for suspicious query patterns or errors indicative of exploitation attempts. 6) If feasible, isolate the CMS database with strict user privileges limiting the impact of any injection. 7) Engage with the vendor or community for updates or patches and plan for timely application once available. 8) Educate developers and administrators on secure coding practices and vulnerability management to prevent recurrence.