CVE-2026-54298— Astro: XSS via Unescaped Attribute Names in Spread Props
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I. Basic Information for CVE-2026-54298
Vulnerability Information
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Vulnerability Title
Astro: XSS via Unescaped Attribute Names in Spread Props
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-54298
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|---|
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Other References for CVE-2026-54298 (1)
Same Patch Batch · withastro · 2026-06-22 · 4 CVEs total
| CVE-2026-54299 | 7.5 HIGH | Astro: Host-header full-read SSRF in core prerendered error-page fetch (prerenderedErrorPa |
| CVE-2026-50146 | 7.1 HIGH | Astro: Reflected XSS via unescaped slot name |
| CVE-2026-54300 | 5.3 MEDIUM | @astrojs/netlify broadens Astro image.remotePatterns in Netlify Image CDN config |
IV. Related Vulnerabilities
Same product: astro
- CVE-2026-54299
Astro: Host-header full-read SSRF in core prerendered error- - CVE-2026-50146
Astro: Reflected XSS via unescaped slot name - CVE-2026-54300
@astrojs/netlify broadens Astro image.remotePatterns in Netl - CVE-2026-45028
Astro: Server island encrypted parameters vulnerable to cros - CVE-2026-41248
Official Clerk JavaScript SDKs: Middleware-based route prot
Same vendor: withastro
- CVE-2026-54299
Astro: Host-header full-read SSRF in core prerendered error- - CVE-2026-50146
Astro: Reflected XSS via unescaped slot name - CVE-2026-54300
@astrojs/netlify broadens Astro image.remotePatterns in Netl - CVE-2026-45028
Astro: Server island encrypted parameters vulnerable to cros - CVE-2026-41322
@astrojs/node: Cache Poisoning due to incorrect error handli
Same weakness: CWE-79
- CVE-2026-57656
WordPress Hester Core plugin <= 1.1.8 - Cross Site Scripting - CVE-2026-57651
WordPress Ghost Kit plugin <= 3.6.0 - Cross Site Scripting ( - CVE-2026-57650
WordPress Magazine Blocks plugin <= 1.8.3 - Cross Site Scrip - CVE-2026-57638
WordPress Fluent Booking plugin <= 2.1.0 - Cross Site Script - CVE-2026-57629
WordPress StatCounter plugin <= 2.1.1 - Cross Site Scripting
V. Comments for CVE-2026-54298
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