CVE-2026-114128 · GHSA-98hj-9722-w3j8

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

Risk score: 49/100
CVSS: 6.5 v3.1
Exploit chance (30 days): 0.3%
Published: 21 Oct 2026

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What to know

What it is: 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 …
Affected: astro (npm) < 7.3.2
Fix: Upgrade astro to 7.3.2 or later.
Exploitation: No known exploitation

Why it is Yellow

CVSS 6.5 medium
On your watchlist: npm

Affected packages

Package	Ecosystem	Vulnerable	Fixed in
astro	npm	< 7.3.2	7.3.2

References

Original 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.

Last activity 21 Oct 2026. Patch Forecast updates every hour.