Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
sveltejs svelte
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 6.1 Difficulty: Moderate EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
sveltejs svelte < 5.55.7 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-42573

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Svelte: XSS via DOM Clobbering of Internal Framework State
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
sveltejs svelte < 5.55.7 -

II. Public POCs for CVE-2026-42573

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-42573

请登录查看更多情报信息。

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-2026-42570 7.5 HIGH Svelte devalue: DoS via sparse array deserialization
CVE-2026-42567 Svelte: ReDoS in `<svelte:element>` Tag Validation
CVE-2026-42599 Cross-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

No comments yet

Leave a comment