Industry Newsprompt injectiondata exfiltrationanthropicopen redirect
Anthropic Faces Claude.ai Data-Exfiltration Vulnerability Named Claudy Day
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9.1
Security researchers disclosed "Claudy Day," a chained vulnerability in Anthropic's Claude.ai that allowed silent data exfiltration via invisible prompt injections, embedded API keys, and unvalidated open redirects. Anthropic patched the prompt injection after responsible disclosure and is working on fixes for remaining issues. The flaw could expose chat histories and connected enterprise resources when attackers exploit Google Ads and prefilled prompt URLs.
Scoring Rationale
High severity, confirmed by researchers and partially patched by Anthropic, but the exploit is vendor-specific and may not generalize broadly.
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