Monday, October 27, 2025

Perplexity’s Comet AI Internet Browser Had a Main Safety Vulnerability

Comet, Perplexity’s new AI-powered net browser, just lately suffered from a major safety vulnerability, in response to a weblog put up final week from Courageous, a competing net browser firm. The vulnerability has since been mounted, nevertheless it factors to the challenges of incorporating giant language fashions into net browsers.

Not like conventional net browsers, Comet has an AI assistant inbuilt. This assistant can scan the web page you are taking a look at, summarize its contents or carry out duties for you. The issue is that Comet’s AI assistant is constructed on the identical know-how as different AI chatbots, like ChatGPT. 

AI chatbots cannot assume and motive the identical means people can, and in the event that they learn a bit of content material meant to control its output, it could find yourself following by way of. This is called immediate engineering

(Disclosure: Ziff Davis, CNET’s guardian firm, in April filed a lawsuit towards OpenAI, alleging it infringed Ziff Davis copyrights in coaching and working its AI methods.)

A consultant for Courageous did not instantly reply to a request for remark. 

AI firms attempt to mitigate the manipulation of AI chatbots, however that may be difficult, as unhealthy actors all the time take a look at novel methods to interrupt by way of protections. 

“This vulnerability is mounted,” mentioned Jesse Dwyer, Perplexity’s head of communications in an announcement. “We’ve a reasonably sturdy bounty program, and we labored immediately with Courageous to determine and restore it.”

AI Atlas

Check used hidden textual content on Reddit

In its testing, Courageous arrange a Reddit web page with invisible textual content on the display screen and requested Comet to summarize the on-screen content material. Because the AI processed the web page’s content material, it could not distinguish between the malicious prompts and commenced feeding Courageous’s testers delicate data. 

On this case, the hidden textual content enabled Comet’s AI assistant to navigate to a person’s Perplexity account, extract the related e-mail handle, and navigate to a Gmail account. The AI agent was primarily appearing as an precise person, that means that conventional safety strategies weren’t working. 

Courageous warns that such a immediate injection can go additional, accessing financial institution accounts, company methods, non-public emails and different companies. 

Courageous’s senior cellular safety engineer, Artem Chaikin, and VP of privateness and safety, Shivan Kaul Sahib, laid out a listing of potential fixes. First, AI net browsers ought to all the time deal with web page content material as untrusted. AI fashions ought to verify to verify they’re following person intent. The mannequin ought to all the time double-check with the person to make sure interactions are appropriate, and agentic searching mode ought to solely activate when the person desires it to.

Courageous’s weblog put up is the primary in a collection concerning challenges dealing with AI net browsers. Courageous additionally has an AI assistant, Leo, embedded in its browser. 

AI is more and more embedded in all components of know-how, from Google searches to toothbrushes. Whereas having an AI assistant is useful, these new applied sciences have completely different safety vulnerabilities. 

Up to now, hackers wanted to be knowledgeable coders to interrupt into methods. When coping with AI, nevertheless, it is potential to make use of squirrely pure language to get previous built-in protections. 

Additionally, since many firms depend on main AI fashions, comparable to ones from OpenAI, Google and Meta, any vulnerabilities in these methods may lengthen to firms utilizing those self same fashions. AI firms have not been open about a lot of these safety vulnerabilities as doing so may tip off hackers, giving them new avenues to use. 


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