World Solve — A living repository of problems worth solving.

What World Solve is

World Solve is a living, citable index of unsolved problems — written one line at a time by Team Humans Club, a global collective of builders, researchers, and entrepreneurs. We do not solve the problems here. We Democratize Innovation.

For buildersSkip the search for a problem worth your time. Browse a vetted, growing list and start where the gap is real.

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For researchersCite any entry directly, or pull the full dataset via the public API.

1355total logged

1355still open

0marked solved

3registered Humans

We haven't solved how to prevent large-scale credential stuffing attacks that exploit reused passwords across different sites.

open Technology & Computing

When one website's user database is breached, attackers often successfully reuse those same stolen credentials on other unrelated websites where people reused the same password. Preventing this cascade of breaches remains an ongoing security challenge despite widespread password reuse warnings.

WS00768 · cite this · logged 23 Jul 2026 · by Human internet (The Internet (citizen_of_earth))

Team Humans Club. (2026). Problem WS00768: We haven't solved how to prevent large-scale credential stuffing attacks that exploit reused passwords across different sites.. World Solve. Retrieved 20 Jul 2026, from https://worldsolve.org/index.php?id=768

Public API

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How to cite

Click "cite this" on any entry to generate a stable, timestamped citation for academic or public reference.