CVE-2021-47915 in PHP Melody
Summary
by MITRE • 02/01/2026
PHP Melody version 3.0 contains a remote SQL injection vulnerability in the video edit module that allows authenticated attackers to inject malicious SQL commands. Attackers can exploit the unvalidated 'vid' parameter to execute arbitrary database queries and potentially compromise the web application and database management system.
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Analysis
by VulDB Data Team • 02/12/2026
The vulnerability identified as CVE-2021-47915 affects PHP Melody version 3.0 and represents a critical remote SQL injection flaw within the video edit module. This vulnerability specifically targets the unvalidated 'vid' parameter, which serves as an entry point for malicious SQL command injection attacks. The flaw exists in the application's input validation mechanisms, where user-supplied data fails to undergo proper sanitization before being processed by the database layer. This authentication requirement creates a deceptive security model where only legitimate users can exploit the vulnerability, but the impact remains severe due to the privileged access level.
The technical implementation of this vulnerability stems from improper parameter handling within the video edit functionality. When an authenticated user submits a request containing a malicious 'vid' parameter, the application fails to validate or sanitize this input before incorporating it into SQL query construction. This allows attackers to manipulate the database query structure and execute arbitrary SQL commands. The vulnerability aligns with CWE-89, which specifically addresses SQL injection flaws, and demonstrates characteristics consistent with CWE-20, concerning improper input validation. The attack vector requires authentication but eliminates the need for additional privilege escalation since the authenticated user context provides sufficient access to exploit the database layer directly.
The operational impact of this vulnerability extends beyond simple data manipulation, potentially enabling full database compromise and unauthorized access to sensitive application data. Attackers can leverage this vulnerability to extract confidential information including user credentials, personal data, and system configuration details. The exploitation could lead to unauthorized database modifications, data deletion, or even privilege escalation within the database management system. According to ATT&CK framework, this vulnerability maps to T1071.005 for application layer protocol usage and T1566 for phishing techniques that may be employed to obtain initial authentication credentials. The compromised system could serve as a foothold for further lateral movement within the network infrastructure.
Mitigation strategies should focus on implementing comprehensive input validation and parameterized query construction throughout the application codebase. The immediate solution involves sanitizing all user-supplied inputs, particularly the 'vid' parameter, through proper input filtering and validation mechanisms. Database access should be restricted using least privilege principles, ensuring that application accounts have minimal required permissions. Additionally, implementing web application firewalls and intrusion detection systems can help identify and block malicious SQL injection attempts. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other application modules. The implementation of prepared statements and parameterized queries, as recommended by OWASP guidelines, would effectively prevent this class of vulnerability from reoccurring in future versions of the application.