Astro: Reflected/Stored XSS via unescaped <script>/<style> tag content in JSX/MDX rendering

[ Description ]Official description

Astro is a web framework for content-driven websites. Prior to 7.3.2, Astro's JSX and MDX rendering pipeline treats string children of script and style elements as trusted HTML without distinguishing compiler-generated literal content from dynamic expression values. An application that passes attacker-controlled data directly as a dynamic child can allow a value containing a closing script or style tag to terminate the element and inject arbitrary HTML and JavaScript. Other JSX expression contexts escape dynamic strings automatically; the issue is limited to script and style children rendered through the astro:jsx renderer, including MDX components. Successful exploitation can produce reflected or stored cross-site scripting under the application's origin. This issue is fixed in 7.3.2.

[ Fixes ]Fixes and patches

• astro 7.3.2Fixed version · GitHub Advisories · npm package astro: upgrade to 7.3.2 or later (affected < 7.3.2)

[ Packages ]Affected open-source packages

• astro npmAffected < 7.3.2 · fixed in 7.3.2 · GHSA-98hj-9722-w3j8

[ References ]References

• github.com/withastro/astro/commit/a548223607b9bb146d5d90ddda495343f9a2a739
• github.com/withastro/astro/pull/17896
• github.com/withastro/astro/releases/tag/astro@7.3.2
• github.com/withastro/astro/security/advisories/GHSA-98hj-9722-w3j8