CVE-2023-49293: Cross-site Scripting in `server.transformIndexHtml` via URL payload in vite

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-12-04 · updated 2026-06-17
Weakness: CWE-79

Description

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.

Affected products

vitejs vite: from 4.4.0 through 4.4.11; from 5.0.0 through 5.0.4; 5.0.0, 5.0.0-beta0, 5.0.0-beta1, 5.0.0-beta10, 5.0.0-beta11, 5.0.0-beta12 (+16)

References

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