-1" OR 58=58 or "dDBEaYYT"="

That string looks like a basic SQL injection payload. It’s designed to be injected into a vulnerable input so that the SQL query becomes logically true (a tautology) and, in the context of something like a login query, could allow bypassing authentication or exposing data.

High-level idea:

• It attempts to break out of a quoted string in a query, then injects a condition like OR 58=58, which is always true.
• If the application builds SQL by concatenating user input directly into the query (unsafe), this can change the WHERE clause from something like username = 'X' AND password = 'Y' to something that always evaluates to true.

Why this matters:

• SQL injection is one of the most common web vulnerabilities.
• It can lead to authentication bypass, data leakage, data modification, or even complete system compromise if the attacker can run arbitrary queries.

Defensive best practices (to prevent this kind of attack):

• Use parameterized queries / prepared statements (do not concatenate user input into SQL).
  • Examples (language-agnostic):
    • Python (psycopg2/sqlite3): cursor.execute("SELECT * FROM users WHERE username = %s AND password = %s", (username, password))
    • Java (JDBC): PreparedStatement ps = conn.prepareStatement("SELECT * FROM users WHERE username = ? AND password = ?"); ps.setString(1, username); ps.setString(2, password);
    • PHP (PDO): $stmt = $pdo->prepare("SELECT * FROM users WHERE username = :u AND password = :p"); $stmt->execute([':u'=>$username, ':p'=>$password]);
• Hash and salt passwords; never store or compare plain passwords. Use password_hash/password_verify (or equivalent) instead of checking raw passwords.
• Validate and whitelist inputs where practical, but rely on parameterization for security.
• Principle of least privilege: the database user used by the application should have minimal rights.
• Disable multiple-statement execution if your DB driver supports it.
• Use a web application firewall and monitor error logs for suspicious input.
• Do not reveal detailed DB errors to users; show generic messages and log details server-side.

If you want, tell me your language/framework, and I’ll show a concrete safe login example that defends against this kind of input.