To be continued…

• Try integers even when you see GUIDs – server may accept both formats
• Inject “id”:“1” into JSON POST bodies even when not normally present
• Hunt mobile apps first – they use APIs directly, usually weaker
• Look specifically for PUT requests – they modify data by ID
• Blind IDORs: no visible response but action still occurs (check email, data changes)
• Change file type extension on resource endpoint: .json vs .xml vs .csv

High-value targets: password changes, private documents, receipts, DM systems, payment views.

• Full Zseano IDOR Guide