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CVE-2026-54298

MEDIUM
4.2
CVSS 3.1
Description
Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6.

Metadata

CVE ID
CVE-2026-54298
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-12 17:46 UTC
Published
2026-06-22 17:33 UTC
Last updated
2026-06-22 17:33 UTC
Primary CWE
CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product
withastro / astro
Sources
cve.org  ·  NVD

Severity & Metrics

4.2 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
withastro astro — < 6.4.6
Weakness (CWE)
CWESourceDescription
CWE-79 cna CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS scores (1)
ScoreSeverityVersionSourceVector
4.2 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
References (1)
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