CVE-2026-126363

Description

Astro is a web framework for content-driven websites. From 0.2.0 until 7.1.2, the @astrojs/solid-js renderer inserted a named slot into the quoted name attribute of an astro-slot wrapper without HTML escaping. A request-controlled slot name containing a quote could terminate the attribute and inject active HTML. Exploitation required a hydrated Solid component using a client:* directive and dynamic access to the attacker-chosen slot property; a component that did not render that slot emitted only escaped fallback content. This issue is fixed in version 7.1.2.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 2.3CVSS 4.0, Lowfrom the CNA (GitHub_M)CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 12 Nov 2026 Published

Weakness

• CWE-79

References

• https://github.com/withastro/astro/security/advisories/GHSA-jmv2-qgxf-f995x_refsource_CONFIRM
• https://github.com/withastro/astro/commit/290b196ddb48de11783ff128e2b7272c61490a20x_refsource_MISC
• https://github.com/withastro/astro/releases/tag/@astrojs/solid-js@7.1.2x_refsource_MISC