[Mission] Race to the Balance

🎯 Race to the Balance (General · Level 1 · +50 XP)

A credit withdrawal endpoint checks member balances before updating, but lacks database row locking, allowing race conditions (TOCTOU).

Learning & Defense Goals:

🎯 Launch Isolated Sandbox on Cyber Lab →

Community Discussion Rules: Discuss methodologies, discovery tactics, and architectural hardening. Please do not post raw flags directly. Share your production remediation code!