---
title: "CVE-2026-73653: @vitest/browser: Browser Mode provider commands bypass the file-access permission gate"
url: https://erroneo.us/security/cve/CVE-2026-73653/
description: "CVE-2026-73653 (@vitest/browser (npm)): 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…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-08-13
date_modified: 2026-08-13
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-73653"
kev: false
cvss: 9.4
epss: 0.0079
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-73653: @vitest/browser: Browser Mode provider commands bypass the file-access permission gate

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.8% , percentile 56: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 56% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @vitest/browser (npm) >= 4.0.0, < 4.1.10, fixed in 4.1.10 ; @vitest/browser (npm) < 3.2.7, fixed in 3.2.7 ; @vitest/browser (npm) >= 5.0.0-beta.1, < 5.0.0-beta.6, fixed in 5.0.0-beta.6 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- npm `@vitest/browser` >= 4.0.0, < 4.1.10 → fixed: 4.1.10
- npm `@vitest/browser` < 3.2.7 → fixed: 3.2.7
- npm `@vitest/browser` >= 5.0.0-beta.1, < 5.0.0-beta.6 → fixed: 5.0.0-beta.6

## Affected products (CVE record)

- vitest-dev vitest: < 3.2.7, >= 4.0.0, < 4.1.10, >= 5.0.0-beta.1, < 5.0.0-beta.6

## Severity

- GitHub_M CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`
- GitHub CVSS 3.1: 9.4 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.79% probability of exploitation activity in the next 30 days; percentile 56.

## Sources

- [GitHub Advisory GHSA-p63j-vcc4-9vmv](https://github.com/advisories/GHSA-p63j-vcc4-9vmv)
- [CVE.org record CVE-2026-73653](https://www.cve.org/CVERecord?id=CVE-2026-73653)
- [NVD entry CVE-2026-73653](https://nvd.nist.gov/vuln/detail/CVE-2026-73653)
- [github.com](https://github.com/vitest-dev/vitest/security/advisories/GHSA-p63j-vcc4-9vmv)
- [github.com](https://github.com/vitest-dev/vitest/pull/10674)
- [github.com](https://github.com/vitest-dev/vitest/pull/10679)
- [github.com](https://github.com/vitest-dev/vitest/pull/10680)
- [github.com](https://github.com/vitest-dev/vitest/commit/33f96a145ef09ca6a43b4e555eb273e64a87be23)
- [github.com](https://github.com/vitest-dev/vitest/commit/5c18dd267ff7f47f24cab2f615a16b37d90feb7f)
- [github.com](https://github.com/vitest-dev/vitest/commit/b795e36b34969bec50b47a9f29d26f799a6a04fb)
- [github.com](https://github.com/vitest-dev/vitest/releases/tag/v3.2.7)
- [github.com](https://github.com/vitest-dev/vitest/releases/tag/v4.1.10)
- [github.com](https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.6)

---
Source page: https://erroneo.us/security/cve/CVE-2026-73653/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt