Research
Hackers use Claude to breach OpenAI infrastructure
The Verge AIhigh confidence
Why it matters
- →Advanced LLMs can now autonomously identify and exploit complex software vulnerabilities across multiple targets.
- →The cost and time required for sophisticated hacking are dropping dramatically, enabling small groups to mimic state-level capabilities.
- →Security teams must assume AI-driven attacks will outpace traditional patching cycles.
Security researchers from Hacktron successfully breached OpenAI’s internal systems using Anthropic’s Claude Opus 5, exploiting a vulnerability in Discourse image processing to gain remote code execution. The team accessed the 'Monorepo' repository and submitted a pull request via an employee's Codex account to verify access, receiving a $6,500 bug bounty from OpenAI. The attack vector was adaptable, allowing the group to compromise infrastructure at Slack, Meta, and GitHub within days using less than $3,000 in API costs. While the vulnerabilities have been patched, the incident highlights how rapidly generative AI is lowering the barrier for sophisticated cyberattacks.
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Claude Opus 5 used to hack OpenAI via Discourse
Anthropic’s Claude Opus 5 just proved it can chain complex vulnerabilities to breach OpenAI’s infrastructure, turning a theoretical risk into a concrete exploit. The Hacktron team leveraged a memory bug in libheif within OpenAI’s Discourse forum to hijack employee accounts, demonstrating that frontier models are now capable of autonomous attack construction. This isn't just about one company's security lapse; it signals that the barrier to executing sophisticated cyberattacks has collapsed, allowing small teams to achieve what previously required state-level resources. The incident highlights a critical shift where AI capability outpaces defensive hygiene, making off-the-shelf models dangerous tools for anyone with $200 a month. By automating exploit development, these models remove the scarcity of high-end hacking expertise that once protected major platforms. We are entering an era where defense must assume attackers have access to autonomous, reasoning agents capable of finding and chaining flaws in real time.
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