Security Flaw in Anthropic's Claude AI Extension Exposes Users to Browser Attacks
Date: 2026-03-23
Attack vector: prompt-injection
Category: real-world
Severity: High

Tracked by the OECD AI Incidents and Hazards Monitor (AIM) as OECD-AIM-2026-03-23-9ef5, dated 2026-03-23. Classified attack vector: prompt-injection. See the AIM incident page (https://oecd.ai/en/incidents/2026-03-23-9ef5) and its cited news sources for full narrative detail.


Mitigations:

Architectural layers (MAESTRO):