-1' OR 5*5=26 or '8g9pTWkb'='

That looks like an incomplete SQL injection payload. It’s the kind of string someone might try to inject into a vulnerable query to alter its logic.

What it suggests:

• It attempts to terminate a string literal (the trailing single quote) and then inject an OR condition into the WHERE clause.
• The 5*5=26 part is false (since 25 ≠ 26), so that alone wouldn’t make the condition true.
• The final part "'8g9pTWkb'='" is incomplete, which would likely cause a syntax error in many SQL parsers.

In short, the exact effect depends on the surrounding SQL query. Without proper input handling, such payloads can be used to bypass checks or cause errors. I won’t help with exploiting systems, but I can help you study defense and exam topics.

Safe, exam-relevant guidance:

• Key concept: SQL injection occurs when user input is directly included in SQL queries without proper sanitization.
• Primary defense: Use parameterized queries (prepared statements) instead of string-concatenated SQL.
• Example (safe) in Python with SQLite:
  • Vulnerable (do not use): cursor.execute("SELECT * FROM users WHERE username = '%s' AND password = '%s'" % (user_input, password))
  • Safe: cursor.execute("SELECT * FROM users WHERE username = ? AND password = ?", (user_input, password))
• Other defenses: least-privilege database accounts, input validation, ORM usage, escaping only when necessary, and monitoring/logging for anomalous queries.
• If you’re studying for an exam, you might be asked to explain:
  • What makes a query vulnerable
  • How parameterization blocks injection
  • How to recognize patterns like OR ... OR ... and tautologies in injections

If you want, tell me your exam topic (e.g., “explain SQL injection,” “give examples of safe queries,” or “show defensive coding patterns”) and I’ll tailor some practice questions and answers.