Observed Signal · Aug 26, 2025 · Security Vulnerability Disclosure · Source: Trending Topics · Impact: 2/5 · Sentiment: Negative
Perplexity's Comet AI Browser Found Vulnerable to Prompt Injection
Perplexity's AI browser Comet, currently available to paying users, has a security vulnerability. Researchers at Brave Software discovered a prompt injection flaw that allows attackers to embed hidden commands in web content. A proof-of-concept using a Reddit comment could trick the assistant into extracting account details and requesting one-time passwords. The vulnerability was reported on July 1, 2025, and publicly disclosed on August 20, 2025. Perplexity said the issue was patched before anyone noticed and that no user data was compromised. Brave reported that later tests showed the fix was incomplete. Security experts warn that traditional mechanisms like same-origin policy and CORS are ineffective against AI assistants acting with full user rights. Proposed protections include separating user instructions from web content, requiring explicit user interaction for sensitive actions, and isolating agentic browsing.
Highlights security risks in AI-powered browsers and agentic AI systems, affecting trust and adoption of AI-driven web automation; relevant to AI infrastructure but not directly adtech-specific.
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Key Takeaways & Evidence Grounding
- Researchers at Brave Software discovered a prompt injection vulnerability in Perplexity's Comet AI browser.
- The flaw allowed hidden commands in web content to extract account details and request one-time passwords.
- The vulnerability was reported to Perplexity on July 1, 2025, and publicly disclosed by Brave on August 20, 2025.
- Perplexity claimed the issue was patched before being noticed and that no user data was compromised.
- Brave reported that subsequent testing after disclosure indicated the vulnerability was not fully fixed.
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