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CVE-2026-50146 Details

Description

Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content into a data-astro-template attribute without HTML escaping the slot name allowing an attacker to break out of the attribute context and inject arbitrary HTML, resulting in reflected XSS during SSR. This vulnerability is fixed in 6.3.3.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CNA: [email protected]CVSS-B:7.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqp	CISA-ADP	ExploitMitigationVendor Advisory
https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqp	[email protected]	ExploitMitigationVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-80	Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)	[email protected]

Affected Products

Product	Versions
astro astro	< 6.3.3
CPE cpe:2.3:a:astro:astro::::::node.js::* Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Jun 23, 2026	CVE Modified	CISA-ADP
Jun 22, 2026	Initial Analysis	[email protected]
Jun 22, 2026	New CVE Received	[email protected]