BugForge - Daily - Cheesy Does It (Repeat)
Daily - Cheesy Does It (Repeat)
This is a repeat of the daily challenge from January 5th, 2026.
Vulnerability Overview
The login functionality is vulnerable to SQL Injection, allowing attackers to bypass authentication and gain unauthorized access to admin accounts. By injecting a payload such as ' or 1=1-- into the username field, the attacker manipulates the underlying SQL query to always evaluate as true, effectively bypassing password validation. The backend constructs SQL queries by directly concatenating user-supplied input without proper sanitization or parameterization, allowing attackers to inject malicious SQL syntax that alters the query logic and bypasses authentication controls.
Key Issues:
- The login endpoint directly concatenates user input into SQL queries without parameterization
- No input validation or sanitization is applied to authentication fields
- SQL injection in the username field allows complete authentication bypass
- Attackers gain unauthorized access to administrative accounts without valid credentials
This represents a classic SQL injection vulnerability where insufficient input handling enables complete authentication bypass.
Vulnerabilities Covered
- SQL Injection (Authentication Bypass) - The login API endpoint constructs SQL queries using unsanitized user input, allowing attackers to inject payloads that bypass password validation and gain unauthorized access to privileged accounts
Classification
- OWASP Top 10: A03:2021 - Injection
- CWE: CWE-89 - Improper Neutralization of Special Elements used in an SQL Command