CVE-2019-25539 in 202CMS
Summary
by MITRE • 03/12/2026
202CMS v10 beta contains a blind SQL injection vulnerability that allows unauthenticated attackers to manipulate database queries by injecting SQL code through the log_user parameter. Attackers can send POST requests to index.php with crafted SQL payloads using time-based blind injection techniques to extract sensitive database information.
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Analysis
by VulDB Data Team • 03/19/2026
The vulnerability identified as CVE-2019-25539 affects 202CMS v10 beta and represents a critical blind sql injection flaw that compromises database security. This vulnerability exists within the application's handling of user input through the log_user parameter, which is processed in the index.php file without proper sanitization or validation. The flaw allows unauthenticated attackers to execute malicious sql code by manipulating the log_user parameter in post requests, effectively bypassing authentication mechanisms and gaining unauthorized access to sensitive database information.
The technical implementation of this vulnerability follows time-based blind sql injection techniques, where attackers craft specific payloads that cause the database to delay responses based on boolean conditions. This methodology enables attackers to extract data character by character through inference, as the application's response time varies depending on whether the injected sql query evaluates to true or false. The vulnerability specifically targets the log_user parameter which is likely used for user authentication or logging purposes, making it a prime target for exploitation. This type of injection vulnerability falls under the CWE-89 classification for sql injection, which is categorized as a common weakness in software security practices.
The operational impact of CVE-2019-25539 extends beyond simple data theft, as it provides attackers with the capability to manipulate database contents, potentially leading to complete system compromise. Unauthenticated access to database information means that attackers can extract user credentials, personal data, system configurations, and other sensitive information without requiring valid login credentials. This vulnerability particularly affects web applications that do not implement proper input validation, output encoding, or prepared statements to handle user-supplied data. The attack vector through POST requests to index.php demonstrates how easily this vulnerability can be exploited in real-world scenarios, as it requires minimal reconnaissance and can be automated using various sql injection frameworks.
Mitigation strategies for this vulnerability should focus on implementing proper input validation and output encoding mechanisms throughout the application. Developers should employ prepared statements or parameterized queries to prevent sql injection attacks, ensuring that user input is properly escaped before being processed by database systems. The application should implement proper authentication checks and rate limiting to prevent automated exploitation attempts. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in the codebase. This vulnerability aligns with several ATT&CK techniques including T1190 for exploit public-facing application and T1071.004 for application layer protocol. Organizations should also consider implementing web application firewalls and database activity monitoring to detect and prevent such injection attacks. The remediation process requires immediate patching of the affected 202CMS version and implementation of secure coding practices to prevent similar issues in future development cycles.