CVE-2026-54298

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.

CVSS v3 4.2 MEDIUM

4.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 2.5

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9	Exploit Vendor Advisory
https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*

History

23 Jun 2026, 17:17

Type	Values Removed	Values Added
References	~~() https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9 - Exploit, Vendor Advisory~~	() https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9 - Exploit, Vendor Advisory

22 Jun 2026, 20:38

Type	Values Removed	Values Added
CPE		cpe:2.3:a:astro:astro::::::node.js::*
First Time		Astro Astro astro
References	~~() https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9 -~~	() https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9 - Exploit, Vendor Advisory

22 Jun 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-22 19:17

Updated : 2026-06-23 17:17

NVD link : CVE-2026-54298

Mitre link : CVE-2026-54298

CVE.ORG link : CVE-2026-54298

JSON object : View

Products Affected

astro

astro

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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