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CVE-2026-42573— Svelte: XSS via DOM Clobbering of Internal Framework State

AI Predicted 6.1 Difficulty: Moderate EPSS 0.32% · P24

Possible ATT&CK Techniques 1AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProductVersion RangeStatus
sveltejssvelte< 5.55.7affected
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I. Basic Information for CVE-2026-42573

Vulnerability Information
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Vulnerability Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Source: NVD (National Vulnerability Database)
Vulnerability Description
Svelte is a performance oriented web framework. Prior to version 5.55.7, Svelte was vulnerable to DOM clobbering of its internal framework state on elements, potentially leading to XSS attacks. This issue has been patched in version 5.55.7.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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)
Vulnerability Title
Svelte 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Svelte是Svelte开源的一种构建 Web 应用程序的新方法。 Svelte 5.55.7之前版本存在跨站脚本漏洞，该漏洞源于DOM污染内部框架状态，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
sveltejssvelte < 5.55.7 -

II. Public POCs for CVE-2026-42573

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III. Intelligence Information for CVE-2026-42573

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Vendor Advisories for CVE-2026-42573 (1)

Vendor Pages for CVE-2026-42573 (1)

Same Patch Batch · sveltejs · 2026-06-09 · 4 CVEs total

CVE-2026-425707.5 HIGHSvelte devalue: DoS via sparse array deserialization
CVE-2026-42567Svelte: ReDoS in `<svelte:element>` Tag Validation
CVE-2026-42599Cross-site scripting via spread attributes in Svelte SSR

IV. Related Vulnerabilities

Same product: svelte
Same vendor: sveltejs
Same weakness: CWE-79

V. Comments for CVE-2026-42573

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