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.
History

Sun, 25 Oct 2026 07:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 22 Oct 2026 12:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 22 Oct 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Astro
Astro astro
Withastro
Withastro astro
Vendors & Products Astro
Astro astro
Withastro
Withastro astro

Wed, 21 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
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.
Title Astro: Reflected/Stored XSS via unescaped <script>/<style> tag content in JSX/MDX rendering
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-10-21T17:32:28.466Z

Updated: 2026-10-23T15:11:02.457Z

Reserved: 2026-10-20T21:53:58.473Z

Link: CVE-2026-114128

cve-icon Vulnrichment

Updated: 2026-10-23T14:47:56.783Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-21T18:17:25.507

Modified: 2026-10-23T15:17:25.413

Link: CVE-2026-114128

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-21T17:32:28Z

Links: CVE-2026-114128 - Bugzilla