A prompt injection vulnerability paired with other flaws can turn a Google search into a full attack chain that could threaten enterprise networks.

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Dark Reading

Oasis Security researchers discovered a three-vulnerability attack chain dubbed 'Claudy Day' targeting Anthropic's Claude AI agent. The chain combines a prompt injection via URL parameters, a data exfiltration channel through the Anthropic Files API, and an open redirect on Claude.ai. An attacker can craft a malicious Google Ad using a legitimate-looking claude.com redirect URL, luring victims into clicking what appears to be the real Claude interface. Once a user sends a prompt, hidden instructions embedded in the URL cause Claude to silently exfiltrate conversation history and sensitive data to an attacker-controlled Anthropic account. The severity escalates significantly if the Claude session has MCP servers or enterprise integrations enabled, potentially allowing attackers to read files, send messages, and access connected services. Anthropic has patched the prompt injection flaw and is working on the remaining issues. Researchers recommend restricting AI agent access and requiring explicit user approval before tools are invoked.

'Claudy Day’ Trio of Flaws Exposes Claude Users to Data Theft