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.
CVE-2026-47428
CRITICALPre-NVD 9.69.6—Trending — 3 sources updated this weekElevated
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 9.6
- EG Score
- 9.6(medium)
- EG Risk
- 59(Track*)EG Risk 59/100SSVC: Track*
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity96% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Watch closely — could escalate to Attend. - EPSS
- 29.2%
- KEV
- Not listed
Published
June 1, 2026
Last Modified
July 15, 2026
Advisory Details (7)
Auto-updated Jul 14, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available
v5.0.0-beta.3
Patch available: vitest-dev/vitest v5.0.0-beta.3 (pre-release)
https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3github_release Patch Available
v4.1.6
Patch available: vitest-dev/vitest v4.1.6
https://github.com/vitest-dev/vitest/releases/tag/v4.1.6github_commit Patch Available
commit 3514f9fa135c (vitest-dev/vitest)
Patch available: vitest-dev/vitest v5.0.0-beta.3 (contains commit 3514f9fa135c)
https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafagithub_commit Patch Available
commit 18af98cee183 (vitest-dev/vitest)
Patch available: vitest-dev/vitest v4.1.6 (contains commit 18af98cee183)
https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06github_pr Patch Available
fix(browser): simplify orchestrator otel carrier
Patch available: vitest-dev/vitest v4.1.6 (PR #10285 merged 2026-05-07)
https://github.com/vitest-dev/vitest/pull/10285github_pr Patch Available
fix(browser): simplify orchestrator otel carrier
Patch available: vitest-dev/vitest v5.0.0-beta.3 (PR #10283 merged 2026-05-07)
https://github.com/vitest-dev/vitest/pull/10283github Patch Available🟡 PoC Available
Vitest browser mode serves unsanitized otelCarrier query parameter as inline script · Advisory · vitest-dev/vitest · GitHub
https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cpppVendor Advisories for CVE-2026-47428(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | prometheus3-13-main-3.13.1-0.1.hum1 | 2026-07-13 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| @vitest/browser | — | 5.0.0-beta.3 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 03:17 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:24 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-18 10:04 UTCEPSS rescore
- 2026-07-16 17:03 UTCEPSS rescore
- 2026-07-16 09:58 UTCVendor advisory
- 2026-07-16 01:34 UTCVendor advisory
- 2026-07-15 16:57 UTCEPSS rescore
- 2026-06-14 23:18 UTCEPSS rescore
- 2026-06-13 23:00 UTCEPSS rescore
- 2026-06-12 23:12 UTCEPSS rescore
- 2026-06-01 14:50 UTCEG score recompute
Related CVEs(same vendor + same CWE)
Same vendor
10 shownredhat
Frequently asked(5)
What is CVE-2026-47428?
CVE-2026-47428 is a critical vulnerability published on June 1, 2026. 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 /vitesttest/ 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…
When was CVE-2026-47428 disclosed?
CVE-2026-47428 was first published in the National Vulnerability Database on June 1, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47428 actively exploited?
CVE-2026-47428 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47428?
CVE-2026-47428 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-47428?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47428, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-47428
Is Your Infrastructure Affected by CVE-2026-47428?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.