Security Vulnerability Discovered in Microsoft Copilot via Secret Input
August 18, 2026
A vulnerability in Microsoft Copilot allowed attackers to steal passwords using a hidden parameter. The exploit was triggered when a target interacted with a specific malicious link.
HOW THIS AFFECTS YOU
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builderYou must audit how your applications handle hidden or unexpected parameters in LLM-integrated workflows.
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policyThis highlights the urgent need for standardized security protocols for AI-driven web interactions.