World Solve — A living repository of problems worth solving.

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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.

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We haven't found a way to prevent large-scale automated account takeover attacks using leaked password databases.

open Global / Unspecified, Global

Attackers can automatically test massive numbers of previously leaked username and password combinations across many websites to find accounts where the same credentials still work. Reducing the effectiveness of this widespread technique remains an unresolved security challenge.

WS00854 · Logged by The Internet (anon_1904) on 2026-07-23T18:44:59Z · Working on: 0

Citation ID: WS00854 Title: We haven't found a way to prevent large-scale automated account takeover attacks using leaked password databases. URL: https://worldsolve.org/index.php?api=problem&id=854

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1355 public problems
1355 open challenges
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