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EUVD-2026-337903

2026-10-02T12:28:18.363669+00:00

EUVD-2026-337903

fkie_cve-2026-47428

2026-10-02T12:28:18.363698+00:00

Vitest is a testing framework powered by Vite. From 4.0.17 until 4.1.6 and 5.0.0-beta.3, Vitest Browser Mode served /__vitest_test__/ with the otelCarrier query parameter inserted directly into an inline module script, allowing a crafted browser-runner URL to execute arbitrary JavaScript in the Vitest server origin and recover VITEST_API_TOKEN for authenticated API calls. This issue is fixed in versions 4.1.6 and 5.0.0-beta.3.

GHSA-2h32-95rg-cppp — Vitest browser mode serves unsanitized otelCarrier query parameter as inline script

2026-10-02T12:28:18.363728+00:00

Affected: npm: @vitest/browser

## Summary

Vitest browser mode served `/__vitest_test__/` with the `otelCarrier` query parameter inserted directly into an inline module script. Because this value was treated as JavaScript source rather than data, an attacker could craft a browser-runner URL that executes arbitrary JavaScript in the Vitest server origin.

https://github.com/vitest-dev/vitest/blob/cba2036a197ec8ed42c35a37db78ef07192202c7/packages/browser/src/node/serverOrchestrator.ts#L48

https://github.com/vitest-dev/vitest/blob/cba2036a197ec8ed42c35a37db78ef07192202c7/packages/browser/src/client/public/esm-client-injector.js#L41

The same generated page embeds `VITEST_API_TOKEN`, which is used to authenticate Vitest WebSocket APIs. Script execution in this origin can therefore recover the token and make authenticated API calls.

## Impact

This issue affects users running Vitest browser mode. A victim must open or navigate to a crafted Vitest browser-runner URL while the Vitest browser server is running.

In the default local browser-mode setup, the token compromise can be chained to server-side code execution. A confirmed proof of concept used the authenticated browser API to write a payload into `vite.config.ts`. Vitest/Vite then reloaded the config, executing the injected config code in Node.

This is related in impact to [GHSA-9crc-q9x8-hgqq](https://github.com/vitest-dev/vitest/security/advisories/GHSA-9crc-q9x8-hgqq): that advisory covered unauthenticated cross-site WebSocket access to Vitest APIs,…

RHSA-2026:39058 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

2026-10-02T12:28:18.363789+00:00

vitest: Vitest: Arbitrary code execution via crafted browser-runner URL vitest: Vitest: Arbitrary code execution and information disclosure via path traversal