The Astro web framework has a DOM Clobbering gadget in the client-side router. This issue can lead to cross-site scripting (XSS) in websites that enable Astro's client-side routing and have stored attacker-controlled scriptless HTML elements, such as `iframe` tags with unsanitized `name` attributes, on the destination pages. The vulnerability can result in XSS attacks on websites built with Astro that enable client-side routing with `ViewTransitions` and store user-inserted scriptless HTML tags without properly sanitizing the `name` attributes on the page.