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I. Basic Information for CVE-2026-27122
Vulnerability Information

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Vulnerability Title
Svelte SSR does not validate dynamic element tag names in `<svelte:element>`
Source: NVD (National Vulnerability Database)
Vulnerability Description
svelte performance oriented web framework. Prior to 5.51.5, when using <svelte:element this={tag}> in server-side rendering, the provided tag name is not validated or sanitized before being emitted into the HTML output. If the tag string contains unexpected characters, it can result in HTML injection in the SSR output. Client-side rendering is not affected. This vulnerability is fixed in 5.51.5.
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 5.51.5之前版本存在跨站脚本漏洞,该漏洞源于服务器端渲染期间未验证或清理标签名称,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
VendorProductAffected VersionsCPESubscribe
sveltejssvelte < 5.51.5 -
II. Public POCs for CVE-2026-27122
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III. Intelligence Information for CVE-2026-27122
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IV. Related Vulnerabilities
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