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Sunday, 13 September 2026
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Incident database

Perplexity Comet browser agent hijacked by text on a web page

Brave's security team showed that instructions hidden in a Reddit post could make Perplexity's Comet browser agent open a user's banking or email session and leak one-time codes to the attacker.

Occurred 25 July 2025 · Disclosed 20 August 2025 · Record updated 13 September 2026

Impact

Full account takeover of any site the user was logged into. Brave said Perplexity's initial fix was incomplete and later confirmed mitigation.

Our coverage

Sources

  1. brave.comhttps://brave.com/blog/comet-prompt-injection/