CVE-2026-27119— Svelte affected by XSS in SSR `<option>` element
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I. Basic Information for CVE-2026-27119
Vulnerability Information
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Vulnerability Title
Svelte affected by XSS in SSR `<option>` element
Source: NVD (National Vulnerability Database)
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: 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 5.39.3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
II. Public POCs for CVE-2026-27119
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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
- CVE-2026-27902
Svelte Vulnerable to XSS via HTML Comment Injection in SSR E - CVE-2026-27901
Svelte vulnerable to XSS during SSR with contenteditable `bi - CVE-2026-27125
Svelte SSR attribute spreading includes inherited properties - CVE-2026-27122
Svelte SSR does not validate dynamic element tag names in `< - CVE-2026-27121
Svelte affected by cross-site scripting via spread attribute
Same vendor: sveltejs
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SvelteKit has a BODY_SIZE_LIMIT bypass in @sveltejs/adapter- - CVE-2026-30226
devalue has prototype pollution in devalue.parse and devalue - CVE-2026-27902
Svelte Vulnerable to XSS via HTML Comment Injection in SSR E - CVE-2026-27901
Svelte vulnerable to XSS during SSR with contenteditable `bi
Same weakness: CWE-79
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V. Comments for CVE-2026-27119
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