Epoch AI researchers report that the open-weight model GLM 5.3 turned public Firefox security fixes into working exploit chains with zero human input, compromising six Firefox releases before updates reached users. Each chain reportedly cost roughly $1,000 in API fees. The runs did not trigger safeguards from any of the providers tested.
It offers a concrete, attributed measurement of autonomous offensive cyber capability in a widely available open-weight model, which matters to anyone deploying, evaluating or defending against such models.
Epoch AI researchers say the widely available AI model GLM 5.3 turned public security fixes into working exploits before updates reached Firefox users. It autonomously compromised six Firefox releases for about $1,000 in API fees each without triggering safeguards from any provider tested.
The article Open-weight model GLM 5.3 built full Firefox exploit chains with zero human input in under 48 hours appeared first on The Decoder.
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