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Researchers at Zenity Labs discovered flaws affecting multiple AI browsers, including Perplexity’s Comet. Before being patched, an attacker could exploit them via a legitimate calendar invite, using a prompt injection to force the AI browser to act against its user. (Image via Getty)

Researchers discover suite of agentic AI browser vulnerabilities

Madhu Gottumukkala, acting director of the Cybersecurity and Infrastructure Security Agency, testifies during the DHS oversight hearing in the Cannon House office building on Jan. 21, 2026. (Photo by Heather Diehl/Getty Images)

Gottumukkala out, Andersen in as acting CISA director

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