---
id: CVE-2026-112945
title: 'Vite: Cross origin script execution through Vite custom middleware'
summary: >-
  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.
  getHtm…
severity: low
cvss: 2.1
cvssVector: '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'
cvssSource: cna
cwe:
  - CWE-80
vendor: vitejs
product: vite
affected:
  - 'vite >= 8.3.0, < 8.3.3'
  - 'vite >= 8.2.0, < 8.2.4'
  - 'vite >= 8.0.0, < 8.1.6'
  - 'vite >= 7.0.0, < 7.3.7'
  - vite < 6.4.4
  - vite-plus < 1.1.0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T15:00:58.170Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112945'
references:
  - url: 'https://github.com/vitejs/vite/security/advisories/GHSA-9jrq-w75r-8gcw'
    label: 'https://github.com/vitejs/vite/security/advisories/GHSA-9jrq-w75r-8gcw'
  - url: 'https://github.com/vitejs/vite/pull/23653'
    label: 'https://github.com/vitejs/vite/pull/23653'
  - url: >-
      https://github.com/vitejs/vite/commit/7dafd8e56f152403a3230608fa4005273c2e9e17
    label: >-
      https://github.com/vitejs/vite/commit/7dafd8e56f152403a3230608fa4005273c2e9e17
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.335Z'
---

## Overview

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.

## Affected

- `vite >= 8.3.0, < 8.3.3`
- `vite >= 8.2.0, < 8.2.4`
- `vite >= 8.0.0, < 8.1.6`
- `vite >= 7.0.0, < 7.3.7`
- `vite < 6.4.4`
- `vite-plus < 1.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.