{"cve":"CVE-2026-50146","nvd":{"published":"2026-06-22T19:17:04.610","modified":"2026-10-25T23:10:00.167","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-80"],"references":["https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqp","https://github.com/withastro/astro/security/advisories/GHSA-8hv8-536x-4wqp"],"products":["astro:astro"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-50146","score":0.00268,"percentile":0.18795,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-8hv8-536x-4wqp","url":"https://osv.dev/vulnerability/GHSA-8hv8-536x-4wqp","summary":"Astro: Reflected XSS via unescaped slot name","modified":"2026-08-12T20:45:07.780403602Z","packages":[{"ecosystem":"npm","name":"astro","purl":"pkg:npm/astro","ranges":["<6.3.3"],"fixed":["6.3.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}