Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N R C L L N 6.1 .0027 19.1 —
AFFECTED Product Versions Fixed astro < 6.3.3 – —
TIMELINE Jun 3 Reserved by GitHub_M Jun 22 EXPLOIT PUBLISHED — CVE-2026-50146 (withastro astro). Public exploit reference added. Jun 22 Published (CNA: GitHub_M)
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.
| Date | Event | Detail |
|---|---|---|
| June 3, 2026 | Reserved | Reserved by GitHub_M |
| June 22, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-50146 (withastro astro). Public exploit reference added. |
| June 22, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| withastro | astro | — | < 6.3.3 | — |
Authoritative record: CVE-2026-50146 at cve.org
Vendors: withastro
Weaknesses: CWE-80
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-50146 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.