Flutterby™! : HashJacking just sounds dirty

HashJacking just sounds dirty

2025-11-26 19:17:51.076272+01 by Dan Lyke 0 comments

The Register: HashJack attack shows AI browsers can be fooled with a simple ‘#’

Cato describes HashJack as "the first known indirect prompt injection that can weaponize any legitimate website to manipulate AI browser assistants." It outlines a method where actors sneak malicious instructions into the fragment part of legitimate URLs, which are then processed by AI browser assistants such as Copilot in Edge, Gemini in Chrome, and Comet from Perplexity AI. Because URL fragments never leave the AI browser, traditional network and server defenses cannot see them, turning legitimate websites into attack vectors.

Via.

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(You should probably use "Text" mode: URLs will be mostly recognized and linked, _underscore quoted_ text is looked up in a glossary, _underscore quoted_ (http://xyz.pdq) becomes a link, without the link in the parenthesis it becomes a <cite> tag. All <cite>ed text will point to the Flutterby knowledge base. Two enters (ie: a blank line) gets you a new paragraph, special treatment for paragraphs that are manually indented or start with "#" (as in "#include" or "#!/usr/bin/perl"), "/* " or ">" (as in a quoted message) or look like lists, or within a paragraph you can use a number of HTML tags:

p, img, br, hr, a, sub, sup, tt, i, b, h1, h2, h3, h4, h5, h6, cite, em, strong, code, samp, kbd, pre, blockquote, address, ol, dl, ul, dt, dd, li, dir, menu, table, tr, td, th

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