https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-06T05:43:43.428176+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/cve-2023-49293 CVE-2023-49293 — Cross-site Scripting in `server.transformIndexHtml` via URL payload in vite 2026-10-06T05:43:43.457045+00:00

Affected: vitejs vite

Vite is a website frontend framework. When Vite's HTML transformation is invoked manually via `server.transformIndexHtml`, the original request URL is passed in unmodified, and the `html` being transformed contains inline module scripts (`<script type="module">...</script>`), it is possible to inject arbitrary HTML into the transformed output by supplying a malicious URL query string to `server.transformIndexHtml`. Only apps using `appType: 'custom'` and using the default Vite HTML middleware are affected. The HTML entry must also contain an inline script. The attack requires a user to click on a malicious URL while running the dev server. Restricted files aren't exposed to the attacker. This issue has been addressed in vite@5.0.5, vite@4.5.1, and vite@4.4.12. There are no known workarounds for this vulnerability.

 https://vulnerability.circl.lu/vuln/ghsa-92r3-m2mg-pj97 GHSA-92r3-m2mg-pj97 — Vite XSS vulnerability in `server.transformIndexHtml` via URL payload 2026-10-06T05:43:43.457272+00:00

Affected: npm: vite

### Summary When Vite's HTML transformation is invoked manually via `server.transformIndexHtml`, the original request URL is passed in unmodified, and the `html` being transformed contains inline module scripts (`<script type="module">...</script>`), it is possible to inject arbitrary HTML into the transformed output by supplying a malicious URL query string to `server.transformIndexHtml`.

### Impact Only apps using `appType: 'custom'` and using the default Vite HTML middleware are affected. The HTML entry must also contain an inline script. The attack requires a user to click on a malicious URL while running the dev server. Restricted files aren't exposed to the attacker.

### Patches Fixed in vite@5.0.5, vite@4.5.1, vite@4.4.12

### Details Suppose `index.html` contains an inline module script:

```html <script type="module"> // Inline script </script> ```

This script is transformed into a proxy script like

```html <script type="module" src="/index.html?html-proxy&index=0.js"></script> ```

due to Vite's HTML plugin:

https://github.com/vitejs/vite/blob/7fd7c6cebfcad34ae7021ebee28f97b1f28ef3f3/packages/vite/src/node/plugins/html.ts#L429-L465

When `appType: 'spa' | 'mpa'`, Vite serves HTML itself, and `htmlFallbackMiddleware` rewrites `req.url` to the canonical path of `index.html`,

https://github.com/vitejs/vite/blob/73ef074b80fa7252e0c46a37a2c94ba8cba46504/packages/vite/src/node/server/middlewares/htmlFallback.ts#L44-L47

so the `url` passed to `server.transformInd…