Challenges → Web Exploitation

JWT None Algorithm

Hard 250 pts 🚩 26 solves ⏱ Avg. time to solve: 55d 5h

Challenge Question

This verification service trusts a signed token to say who you are, and it takes the token's own claim about which signing algorithm was used at face value. Not every algorithm actually requires a signature to be trusted. Forge a token that verifies as someone you're not.
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Details

  • CategoryWeb Exploitation
  • Authortark
  • AddedJul 4, 2026
  • Avg. Time to Solve55d 5h
  • First Blood🩸 apopov

Recent Solvers

  • NoOne_XOXO 5h ago
  • linhmu3 3d ago
  • piyush69 5d ago
  • Max Oct 18, 2026
  • amalmj Oct 7, 2026
  • Insolentxvx Oct 5, 2026
  • V1XU Oct 4, 2026
  • 0x45h1k Oct 3, 2026
  • ajay Oct 2, 2026
  • rijandahal Sep 21, 2026
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