CVE-2025-13575 is a SQL injection vulnerability affecting code-projects Blog Site version 1.0. The vulnerability resides in the category_exists function located in the /resources/functions/blog.php file, part of the Category Handler component. The flaw arises from improper sanitization and validation of the 'name' or 'field' argument, which an attacker can manipulate remotely to inject malicious SQL commands. This injection can lead to unauthorized reading, modification, or deletion of database records. The vulnerability does not require authentication or user interaction, increasing its risk profile. Multiple endpoints are vulnerable, expanding the attack surface. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no exploits have been observed in the wild, the public disclosure increases the likelihood of future exploitation attempts. The vulnerability's presence in a blogging platform means that compromised sites could be used to leak sensitive data, deface content, or serve as a foothold for further network intrusion. The lack of patches or official remediation guidance necessitates immediate attention from administrators to implement custom mitigations.

For European organizations using code-projects Blog Site 1.0, this vulnerability poses a moderate risk. Exploitation could lead to unauthorized access to sensitive blog content, user data, or administrative information, impacting confidentiality. Integrity could be compromised by unauthorized modification or deletion of blog posts or categories, potentially damaging organizational reputation. Availability may be affected if attackers execute commands that disrupt database operations or crash the application. Given the remote exploitability without authentication, attackers can target exposed web servers directly. Organizations in sectors relying heavily on web presence, such as media, education, or small businesses, may face reputational damage and operational disruption. Additionally, if the platform is integrated with other internal systems, lateral movement or data exfiltration risks increase. The moderate CVSS score reflects these impacts but also indicates that exploitation complexity is not trivial, somewhat limiting widespread attacks. However, the public disclosure and multiple vulnerable endpoints increase the urgency for mitigation.

To mitigate CVE-2025-13575, organizations should first conduct a thorough code audit of the category_exists function and all related input handling in /resources/functions/blog.php. Implement strict input validation and sanitization, using parameterized queries or prepared statements to prevent SQL injection. If possible, upgrade to a patched version once available or apply vendor-supplied patches promptly. In the absence of official patches, consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the vulnerable parameters. Restrict network access to the blog site to trusted IPs where feasible and monitor logs for unusual database queries or error messages indicative of injection attempts. Regularly back up databases and test restoration procedures to minimize impact from potential data corruption. Educate developers and administrators on secure coding practices to prevent similar vulnerabilities. Finally, maintain awareness of updates from the vendor or security community regarding this vulnerability.