Claude AI Vulnerability: How Hackers Steal Data via Prompt Injection Attacks (2025)

A security researcher has uncovered a potential data breach nightmare for AI users. Your AI Assistant Might Be Leaking Your Secrets!

SecurityWeek reveals a critical vulnerability in Anthropic's Claude AI model, a powerful language tool. The issue lies in its Files APIs, which, when exploited, can lead to a severe data theft scenario. Here's the catch: an attacker could craft a malicious prompt, tricking Claude into storing user data in a file within its Code Interpreter.

But here's where it gets controversial: the attacker then instructs Claude to upload this file from its sandbox, effectively exfiltrating the data to their account. This technique allows for a whopping 30MB of data theft in one go, and it doesn't stop there—multiple files can be uploaded, according. to Johann Rehberger, the researcher who discovered this vulnerability.

The implications are alarming, as chat conversations saved by Claude's memory function could be compromised. This raises concerns about the privacy and security of user data in AI systems.

Anthropic, now aware of this issue, has yet to offer a solution. This leaves users wondering: Are our digital assistants as secure as we think? The clock is ticking for Anthropic to address this critical vulnerability and ensure user data remains protected.

Claude AI Vulnerability: How Hackers Steal Data via Prompt Injection Attacks (2025)
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