Vulnerability · Published Jul 14, 2026 · Assigned by GitHub_M
CVE-2026-47428Vitest browser mode serves unsanitized otelCarrier query parameter as inline script
Critical 9.6
In plain English
A critical-severity cross-site scripting in vitest from vitest-dev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @vitest/browser | 4.1.6 | GHSA-2h32-95rg-cppp |
| npm | @vitest/browser | 5.0.0-beta.3 | GHSA-2h32-95rg-cppp |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vitest-dev | vitest | >= 4.0.17, < 4.1.6>= 5.0.0-beta.0, < 5.0.0-beta.3 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp x_refsource_CONFIRM
- https://github.com/vitest-dev/vitest/pull/10283 x_refsource_MISC
- https://github.com/vitest-dev/vitest/pull/10285 x_refsource_MISC
- https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06 x_refsource_MISC
- https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafa x_refsource_MISC
- https://github.com/vitest-dev/vitest/releases/tag/v4.1.6 x_refsource_MISC
- https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3 x_refsource_MISC