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7/15/2026
How a BOLA authorization flaw exposed all user data days after launch

How a BOLA authorization flaw exposed all user data days after launch

Original: How BOLA killed my MVP (and what I wish I'd done before launch)

Short summary

A founder built a project management MVP using Cursor and Supabase, only to discover a Broken Object Level Authorization (BOLA) flaw days after launch — users could access other users' projects by changing URL IDs. The fix was a single .eq('user_id', session.user.id) call missing from six routes. BOLA is OWASP API Top 10 #1, yet many AI-assisted builds skip authorization testing entirely.

  • •BOLA (Broken Object Level Authorization) found 2 days post-launch — users could see other users' data
  • •Fix was adding one ownership check line missing from six API routes
  • •OWASP API Top 10 #1 vulnerability class often missed in AI-assisted development

Generated with AI, which can make mistakes.

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