Event Brief
Hackers used Claude to access OpenAI employee accounts
By The BriefBrief · Sources (5)
Filed: Sep 18, 2026 at 9:00 PM ET
Summary: Three independent security researchers at Hacktron said it took them less than 72 hours to hack into OpenAI employee accounts using Anthropic’s Claude Opus 4.8 and 5. They reported gaining access to OpenAI’s GitHub “Monorepo,” which they say contains “algorithmic secrets.”
WHO: Three independent security researchers at Hacktron
WHAT: Reportedly hacked into OpenAI employee accounts using Anthropic’s Claude and accessed OpenAI’s GitHub Monorepo repository
WHEN: Sep 18, 2026 at 11:30 AM ET
WHERE: Location not specified
WHY: Cause not yet established.
How this brief is built: The BriefBrief uses multi-source information fusion to correlate reporting across sources, identify related developments, and continuously update a structured WHO, WHAT, WHEN, WHERE and WHY event picture. Pattern arcs, source analysis, and velocity indicators provide deeper analysis in our MI Console.
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