Anthropic Claude Data Exfiltration Vulnerability Fixed
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securitysafety
Source: Embrace The RedAugust 1, 2023
Summary
Anthropic patched a data exfiltration vulnerability in Claude caused by image markdown injection, a technique where attackers embed hidden instructions in image links to trick the AI into leaking sensitive information. While Microsoft fixed this vulnerability in Bing Chat and OpenAI chose not to address it in ChatGPT, Anthropic implemented a mitigation to protect Claude users from this attack.
Classification
Attack Type
Data Extraction
Attack SophisticationModerate
Impact (CIA+S)
confidentialityintegrity
Affected Vendors
AnthropicOpenAIMicrosoft
Related Issues
Original source: https://embracethered.com/blog/posts/2023/anthropic-fixes-claude-data-exfiltration-via-images/
First tracked: February 12, 2026 at 02:20 PM
Classified by LLM (prompt v3) · confidence: 85%