What’s Vulnerable › Vulnerabilities

CVE-2026-47428: Vitest browser mode serves unsanitized otelCarrier query parameter as inline script

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-79

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 products

• vitest-dev vitest: from 4.0.17, < 4.1.6; from 5.0.0-beta.0, < 5.0.0-beta.3

References

• https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06
• https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafa
• https://github.com/vitest-dev/vitest/pull/10283
• https://github.com/vitest-dev/vitest/pull/10285
• https://github.com/vitest-dev/vitest/releases/tag/v4.1.6
• https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3
• https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp
• https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp

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