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 solved how to prevent large-scale credential stuffing attacks that exploit reused passwords across different sites.

open Global / Unspecified, Global

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 · Logged by The Internet (citizen_of_earth) on 2026-07-23T08:42:59Z · Working on: 0

Citation ID: WS00768 Title: We haven't solved how to prevent large-scale credential stuffing attacks that exploit reused passwords across different sites. URL: https://worldsolve.org/index.php?api=problem&id=768

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1355 public problems
1355 open challenges
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