-1' OR 5*5=26 or '0GhXrEYQ'='

It looks like an SQL injection attempt. The string "-1' OR 5*5=26 or '0GhXrEYQ'='" tries to break out of a quoted value in a query and inject OR conditions to alter the logic of a WHERE clause.

What this kind of payload is doing (at a high level):

• -1' attempts to terminate a preceding string literal in the SQL statement.
• OR 55=26 adds a boolean condition using OR. Since 55 is 25, 5*5=26 is false; the attacker is testing how the query reacts to injected logic.
• or '0GhXrEYQ'='' adds another boolean clause that evaluates to false (a non-empty string isn’t equal to an empty string).

In practice, attackers try to coerce the query into returning true regardless of the intended input (for example, to bypass authentication). Modern applications should be resistant to this through proper input handling and coding practices.

Defensive measures (exam-relevant takeaways):

• Use parameterized queries (prepared statements) so user input is never concatenated into SQL strings.
  • Example (conceptual):
    • Bad (vulnerable): SELECT * FROM users WHERE username = '\(username' AND password = '\)password';
    • Good (parameterized): SELECT * FROM users WHERE username = ? AND password = ? (bind username, password)
• Use an ORM or a query builder that uses parameter binding internally.
• Validate input with allow-lists where possible; limit character sets and lengths.
• Avoid dynamic SQL; if dynamic SQL is unavoidable, validate and escape carefully, and use least-privilege database accounts.
• Disable detailed database error messages in production to avoid leaking structure.
• Implement proper authentication checks on the application layer, not relying on SQL behavior.
• Consider using database features like stored procedures with parameter binding, and input validation at multiple layers.
• Logging and anomaly detection: monitor for unusual input patterns that look like injection attempts.

If you want, I can:

• Walk through a concrete vulnerable example and show how parameterization fixes it.
• Create a quick practice exercise with vulnerabilities and then show the safe fix.
• Provide a short checklist you can memorize for exams.