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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-27119— Svelte affected by XSS in SSR `<option>` element

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 5.39.3版本至5.51.4版本存在跨站脚本漏洞，该漏洞源于服务器端渲染输出未正确转义内容，可能导致HTML注入。

AI Predicted 6.1 Difficulty: Easy EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-27119

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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 affected by XSS in SSR `<option>` element
Source: CVE Program / CVE List V5
Vulnerability Description
svelte performance oriented web framework. From 5.39.3, <=5.51.4, in certain circumstances, the server-side rendering output of an <option> element does not properly escape its content, potentially allowing HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/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 5.39.3版本至5.51.4版本存在跨站脚本漏洞，该漏洞源于服务器端渲染输出未正确转义内容，可能导致HTML注入。
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 >= 5.39.3, < 5.51.5 -

II. Public POCs for CVE-2026-27119

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-27119

请登录查看更多情报信息。

Same Patch Batch · sveltejs · 2026-02-20 · 5 CVEs total

CVE-2026-27125 Svelte SSR attribute spreading includes inherited properties from prototype chain
CVE-2026-27118 Cache poisoning in @sveltejs/adapter-vercel
CVE-2026-27122 Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
CVE-2026-27121 Svelte affected by 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-2026-27119

No comments yet

Leave a comment