{"id":"CVE-2026-114128","published":"2026-10-21T18:17:25.507","lastModified":"2026-10-23T15:17:25.413","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/withastro/astro/commit/a548223607b9bb146d5d90ddda495343f9a2a739","tags":[]},{"url":"https://github.com/withastro/astro/pull/17896","tags":[]},{"url":"https://github.com/withastro/astro/releases/tag/astro@7.3.2","tags":[]},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-98hj-9722-w3j8","tags":[]}],"exploitRefs":[{"url":"https://github.com/withastro/astro/commit/a548223607b9bb146d5d90ddda495343f9a2a739","tags":[]},{"url":"https://github.com/withastro/astro/pull/17896","tags":[]},{"url":"https://github.com/withastro/astro/releases/tag/astro@7.3.2","tags":[]},{"url":"https://github.com/withastro/astro/security/advisories/GHSA-98hj-9722-w3j8","tags":[]}],"hasPoc":true,"ai":null}