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CVE-2026-54298

🔶 medium
🔍 Scan for this CVE
Summary

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

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.

CVSS Score
4.2
Medium
EPSS Score
0.2
Exploit Probability
Published Date
2026-06-22
First Seen: 2026-06-25
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 5.4% of all 329,456 vulnerabilities in our database.

#311,645
Below average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Jun 23, 2026
🔍 Exploitation Status
Poc
Proof-of-concept available
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Partial
Limited system impact
SSVC data provided by CISA
Last Modified 2026-06-23
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
CWE IDs (Weakness Types)
CWE-79

📦 Affected Products 1

Vendor Product Status Affected Versions
astro astro Affected
< 6.4.6

🔗 References 1

https://github.com/withastro/astro/security/advisori...
Exploit Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-50146 ⚠️ high 7.1 0.2 Astro is a web framework. Prior to 6.3.3, when a component uses a client:* directive, Astro inserts named slot content i... 2026-06-22
CVE-2026-54299 ⚠️ high 7.5 0.2 Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages (/404 or /500 using export const p... 2026-06-22
CVE-2026-45028 🔶 medium 6.1 0.0 Astro is a web framework. Astro versions prior to 6.1.10 used AES-GCM encryption to protect the confidentiality and inte... 2026-05-13
CVE-2026-41067 🔶 medium 6.1 0.0 Astro is a web framework. Prior to 6.1.6, the defineScriptVars function in Astro's server-side rendering pipeline uses a... 2026-04-24
CVE-2026-33769 🔶 medium 5.3 0.0 Astro is a web framework. From version 2.10.10 to before version 5.18.1, this issue concerns Astro's remotePatterns path... 2026-03-24
CVE-2025-66202 🔶 medium 6.5 0.3 Astro is a web framework. Versions 5.15.7 and below have a double URL encoding bypass which allows any unauthenticated a... 2025-12-09
These CVEs affect the same products