Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M
CVE-2026-112945Vite: Cross origin script execution through Vite custom middleware
Low 2.1
In plain English
A low-severity security flaw in vite from vitejs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | vite | no fix listed | UBUNTU-CVE-2026-112945 |
| Ubuntu:24.04:LTS | vite | no fix listed | UBUNTU-CVE-2026-112945 |
| Ubuntu:26.04:LTS | vite | no fix listed | UBUNTU-CVE-2026-112945 |
| Ubuntu:26.10 | vite | no fix listed | UBUNTU-CVE-2026-112945 |
| npm | vite | 6.4.4 | GHSA-9jrq-w75r-8gcw |
| npm | vite | 8.3.3 | GHSA-9jrq-w75r-8gcw |
| npm | vite | 8.2.4 | GHSA-9jrq-w75r-8gcw |
| npm | vite | 8.1.6 | GHSA-9jrq-w75r-8gcw |
| npm | vite | 7.3.7 | GHSA-9jrq-w75r-8gcw |
| npm | vite-plus | 1.1.0 | GHSA-9jrq-w75r-8gcw |
Affected products (as reported)
Weakness: CWE-80 · Vector: 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
References
- https://github.com/vitejs/vite/security/advisories/GHSA-9jrq-w75r-8gcw x_refsource_CONFIRM
- https://github.com/vitejs/vite/pull/23653 x_refsource_MISC
- https://github.com/vitejs/vite/commit/7dafd8e56f152403a3230608fa4005273c2e9e17 x_refsource_MISC