Oct 29, 2026
Epoch AI reports GLM 5.3 exploited the patch gap in six Firefox releases in offline experiments
Epoch AI reports that GLM 5.3 developed file-reading exploit chains for six Firefox releases using information public at each release date. Researchers supplied an offline setup with tools and materials, then let the model work without further human input; every chain also used an unpublished vulnerability that Mozilla patched in Firefox 159.0.