Dev Tools · 56m ago
Missing preventDefault Bug Locked Users Out of Government MFA
A missing e.preventDefault() in a government MFA rollout caused keyboard-navigating users to hit server errors, blocking access to critical services like driver's license processing and disaster relief. The bug passed all tests and only affected a small subset of users, making it hard to diagnose. The team fixed it by observing real users after logs failed to reveal the issue.
Meridian48 take
The story underscores how a single line of frontend code can cripple essential services, but the real lesson is that testing must include real-world user behavior, not just automated checks.
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You Know What Happens When There's a Bug in Authentication? Absolutely Nothing. →
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