CVE-2026-50146
Last modified
CVE-2026-50146 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.
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/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Astro | Astro | < 6.3.3 |
References
- https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqpExploit, Mitigation, Vendor Advisory
- https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqpExploit, Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
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