https://bytebulletin.com/articles/anthropic-claude-extension-backdoored-on-cursor-for-12-hours-102c6d52 ByteBulletin en 2026-10-31T11:01:41.371Z Anthropic Claude extension backdoored on Cursor for 12 hours https://bytebulletin.com/articles/anthropic-files-335-page-s-1-with-existential-risk-warnings-528e96b2 ByteBulletin en 2026-10-31T11:00:55.207Z Anthropic files 335-page S-1 with existential risk warnings