-1" OR 5*5=26 or "jRKvYR6x"="

What you typed looks like a partial SQL injection payload. It’s the kind of input an attacker might try to break out of a string literal in an SQL query and append a logical condition.

Key ideas behind it (at a high level, exam-focused):

• -1" tries to close a string literal (the quote ends the original string) and then add more SQL.
• OR 55=26 adds a boolean condition. Since 55 is 25, 25=26 is false; attackers often use a true condition like 1=1 to force the WHERE clause to always pass.
• or "jRKvYR6x"=" attempts to add another comparison, often to exploit how the rest of the query is built.

Important caveats:

• The exact effect depends on the database dialect and how the application constructs SQL (string concatenation vs. parameterized queries).
• In many modern setups, double quotes are identifiers (not strings) in some DBs, so the payload may cause syntax errors unless the app is vulnerable.

Defensive takeaways (relevant for exams and real-world practice):

• Never build SQL by concatenating user input. Use parameterized queries or prepared statements.
• Validate and constrain inputs (e.g., allowlists for fields that should be plain text, length limits, character whitelists).
• Use stored procedures with bound parameters, not dynamic SQL.
• Apply least-privilege principles for the app’s database user.
• Handle errors securely (don’t output SQL error details to users; log them securely).
• Consider defense-in-depth: input validation, ORM parameterization, and a Web Application Firewall (WAF) as a supplement.

If you want, I can tailor a quick, exam-focused cheat sheet comparing MySQL, PostgreSQL, and MSSQL injection differences, or walk through safe examples of how parameterized queries stop this kind of input.