Researchers Use Anthropic’s Claude Opus 5 to Hijack OpenAI Staff Accounts and Access Internal Code Repository
What Happened — Three security researchers at Hacktron employed Anthropic’s Claude Opus 5 to chain a bug in OpenAI’s public help‑forum software with a weakness in OpenAI’s login system. The chain let them assume the identities of OpenAI employees, take over ChatGPT and Codex accounts, and reach an internal OpenAI code repository.
Why It Matters for Trust & Control Assurance
- Highlights the risk of privileged‑account takeover when application‑level flaws go unchecked – a core scenario continuous control‑assurance programs are built to detect and prevent.
- Demonstrates the need for strong identity‑and‑access‑management (IAM) controls, MFA enforcement, and real‑time monitoring of privileged logins to provide defensible audit evidence.
- Shows that third‑party AI tools can become vectors for exploitation, requiring documented oversight and risk‑assessment processes.
Who Is Affected – Technology SaaS providers delivering AI services, and any organization that integrates external AI models into internal workflows.
Recommended Actions
- Review IAM policies: enforce MFA for all staff, especially privileged users.
- Deploy continuous monitoring and anomaly detection on login activity and privileged account usage.
- Conduct a third‑party AI tool risk assessment and document controls in your audit evidence repository.
- Validate that software handling public‑facing forums is patched and that authentication mechanisms are hardened.
Source: The Hacker News
Technical Notes
- Attack vector: exploitation of a public‑forum software bug → weakness in OpenAI’s login system (no public CVE disclosed).
- Data accessed: internal source‑code repository (confidential intellectual property).
Source: same as above