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CVE-2026-54298

Astro: XSS via Unescaped Attribute Names in Spread Props

Published: Jun 22, 2026Updated: Jun 23, 2026 Sources: CVE List NVDCWE-79
4.2MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 94.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:RS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

astro
oss-project·USaka @astrojs/cloudflare, @astrojs/node
astroMixed
OSS Libraries / web-framework
withastro
oss-projectaka astro, @astrojs/cloudflare
astroLibrary
OSS Libraries / web-framework

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9
github.com
News mentions
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