GHSA-2rwj-7xq8-4gx4 Qwik has a potential mXSS vulnerability due to improper HTML escaping

• npm @builder.io/qwik: < 1.7.3 → fixed in 1.7.3

Summary A potential mXSS vulnerability exists in Qwik for versions up to 1.6.0. Details Qwik improperly escapes HTML on server-side rendering. It converts strings according to the following rules: https://github.com/QwikDev/qwik/blob/v1.5.5/packages/qwik/src/core/render/ssr/render-ssr.ts#L1182-L1208 • If the string is an attribute value: • `"` -> `&quot;` • `&` -> `&amp;` • Other characters -> No conversion • Otherwise: • ` `&lt;` • `>` -> `&gt;` • `&` -> `&amp;` • Other characters -> No conversion It sometimes causes the situation that the final DOM tree rendered on browsers is different from what Qwik expects on server-side rendering. This may be leveraged to perform XSS attacks, and a type of the XSS is known as mXSS (mutation XSS). PoC A vulnerable component: ```javascript import { component$ } from "@builder.io/qwik"; import { useLocation } from "@builder.io/qwik-city"; export default component$(() => { // user input const { url } = useLocation(); const href = url.searchParams.get("href") ?? "https://example.com"; return ( test ); }); ``` If a user accesses the following URL, ``` http://localhost:4173/?href=alert(123) ``` then, `alert(123)` will be executed. Impact XSS