Poison Claude Sells Discounted Claude Access While Its Operator Sees Every Customer Prompt

Cybersecurity researchers have discovered more than half-a-dozen services advertisements for illegal access to artificial intelligence (AI) models on underground cybercrime forums and messaging platforms. One such service, Poison Claude, claims to offer access to Anthropic's large language models (LLMs), including Opus 4.8, Opus 4.7, Opus 4.6, and Sonnet 4.6. "Advertisements for Poison Claude

The reporting underscores the importance of treating third-party software and infrastructure as part of your own attack surface, since trust in a vendor is only as strong as the vendor’s own security posture.

Beyond patching, organizations should inventory exposed services, disable unused functionality, and require multi-factor authentication wherever it can be deployed.