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HashJack Attack Exploits AI Browsers via URL Manipulation

HashJack Attack Exploits AI Browsers via URL Manipulation

First seen 30 Nov 2025, 12:41 UTC • •

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ThreatCluster AI
ThreatCluster •March 12, 2026 at 13:27 UTC

Cato Networks has identified a new cybersecurity vulnerability named 'HashJack' that allows attackers to manipulate AI browser assistants by embedding malicious prompts in URL fragments after the '#' symbol. This indirect prompt injection technique can weaponize legitimate websites, posing risks such as phishing and data theft for users of AI browsers like Perplexity AI's Comet, Microsoft's Copilot for Edge, and Google's Gemini for Chrome.

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