Open-weight GLM 5.3 autonomously built Firefox exploit chains in under 48 hours

Epoch AI researchers report the widely available open-weight model GLM 5.3 turned public Firefox security fixes into working exploits with zero human input, compromising six Firefox releases before updates reached users.

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Timeline · 1 report

2026-10-30 12:22 · The Decoder
Open-weight model GLM 5.3 built full Firefox exploit chains with zero human input in under 48 hours

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