Attackers use the operator to append their own data to your query results. By using a non-existent ID like -9108 , they ensure the original data is hidden, leaving only their injected values (the 34,34 ) visible. The # at the end simply comments out the rest of your original code to prevent syntax errors.
Ever seen a weird string like -9108 UNION ALL SELECT 34,34# in your server logs? It’s not a glitch—it’s a probe. -9108 UNION ALL SELECT 34,34#
Stop concatenating strings and start using Prepared Statements . #CyberSecurity #WebDev #InfoSec #SQLInjection Option 2: The "Dev-to-Dev" Quick Tip Stop trusting user input! 🛡️ Attackers use the operator to append their own