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CVE-2026-112945— Vite: Cross origin script execution through Vite custom middleware

Quick assessment

Affected
vitejs vite
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.

Vite 是一个用于 JavaScript 的前端工具框架。在 6.4.4、7.3.7、8.1.6、8.2.4 和 8.3.3 版本之前，使用自定义中间件的应用程序存在漏洞：当它们将未经修改的浏览器请求 URL 传递给 时， 函数会使用包含查询参数的请求 URL 来解析本地已存在的文件，同时在生成的代理模块 URL 中保留由攻击者提供的开头斜杠。如果转换后的 HTML 包含内联模块脚本，且受害者的浏览器加载了精心构造的开发服务器页面，那么开头的双斜杠会导致浏览器从 Vite 服务的页面中获取并执行由攻击者控制的模块

CVSS 2.1 · Low

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-112945

Vulnerability Information
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Vulnerability Title
Vite: Cross origin script execution through Vite custom middleware
Source: CVE Program / CVE List V5
Vulnerability Description
Vite is a frontend tooling framework for JavaScript. Prior to 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3, applications using custom middleware are vulnerable when they pass an unchanged browser request URL to server.transformIndexHtml. getHtmlFilename uses the query-bearing request URL to resolve an existing local file while preserving attacker-supplied leading slashes in the generated proxy module URL. If the transformed HTML contains an inline module script and a victim browser loads the crafted development-server page, the leading double slash makes the browser fetch and execute an attacker-controlled module in the Vite-served page. This execution can expose sensitive page data or permit critical actions available to the affected application. This issue is fixed in versions 6.4.4, 7.3.7, 8.1.6, 8.2.4, and 8.3.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Web页面中脚本相关HTML标签转义处理不恰当(基本跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vitejs vite >= 8.3.0, < 8.3.3 -
vitejs vite-plus < 1.1.0 -

II. Public POCs for CVE-2026-112945

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III. Intelligence Information for CVE-2026-112945

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Other References for CVE-2026-112945 (3)

Same Patch Batch · vitejs · 2026-10-20 · 6 CVEs total

CVE-2026-112942 7.5 HIGH launch-editor: `fs.existsSync()` existence check can be bypassed on Windows
CVE-2026-112944 6.3 MEDIUM launch-editor: Editor CLI flag misinterpretation causing arbitrary command execution for s
CVE-2026-112943 6.3 MEDIUM launch-editor: escapeCmdArgs() omits % escaping on Windows
CVE-2026-112947 6.3 MEDIUM Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-inst
CVE-2026-112946 6.3 MEDIUM Vite: Files outside `server.fs.allow` could be served when project paths match system path

IV. Related Vulnerabilities

Same product: vite
Same vendor: vitejs
Same weakness: CWE-80

V. Comments for CVE-2026-112945

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