Auth bypass in Vitest-Dev Vitest

CVE-2026-73653

Vitest is a testing framework powered by Vite. Prior to versions 3.2.7, 4.1.10, and 5.0.0-beta.6, Browser Mode provider commands including upload, takeScreenshot, screenshotMatcher, stopChunkTrace, deleteTracing, and annotateTraces accept browser-supplied file paths without enforcing the allowWrite permission gate or confining paths to the project root. A client that can reach the Browser Mode API can read arbitrary local files, create or overwrite image and trace files, or delete files accessible to the Vitest process even when allowWrite is false. This issue is fixed in versions 3.2.7, 4.1.10, and 5.0.0-beta.6.

Vulnerability class: Path Traversal (Directory Traversal)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

EPSS: 0.008 (54.5th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-73653: held from 0.006 to 0.008.

EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.001

Affected products

  • Vitest-Dev Vitest — versions < 3.2.7, >= 4.0.0, < 4.1.10, >= 5.0.0-beta.1, < 5.0.0-beta.6

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-73653?
CVE-2026-73653 is a critical-severity vulnerability in Vitest-Dev Vitest, classified under Path Traversal. CVSS score: 9.4/10. Published 2026-08-13.
How severe is CVE-2026-73653?
Critical severity. CVSS v3 base score is 9.4 out of 10.