CVE-2026-50146

MediumCVSS 6.1/10Last modified Jun 23, 2026

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 3.1 6.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-80

Affected software

No affected versions have been published.

Timeline

Published: Jun 22, 2026
Last modified: Jun 23, 2026
NVD status: Modified

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