Epoch AI researchers demonstrated that the open-weight GLM 5.3 model could autonomously exploit security vulnerabilities across six Firefox releases.
Epoch AI researchers demonstrated that the open-weight GLM 5.3 model could autonomously exploit security vulnerabilities across six Firefox releases.
By analyzing security patches before they reached users, the model created attacks capable of accessing local files simply by having someone visit a malicious webpage. Each successful exploit cost approximately $1,000, and Mozilla addressed a critical vulnerability used in the attacks with Firefox 159.0 on October 27.