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Fencer Vulns
critical 9.8

CVE-2026-53633 json

Vitest: Exposed Browser Mode API Can Proxy CDP and Overwrite Config Files, Leading to RCE

published 2026-06-15 4 mo ago modified 2026-10-24 15 d ago also GHSA-g8mr-85jm-7xhm , EUVD-2026-44403

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.9%
EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits
0
none known

Summary

Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to use CDP Page.setDownloadBehavior and Runtime.evaluate to overwrite vite.config.ts and execute attacker-controlled Node.js code. This issue is fixed in versions 3.2.5, 4.1.8, and 5.0.0-beta.

Patch / fix

  • npm @vitest/browser 3.2.5, 4.1.8, 5.0.0-beta.4
  • npm vite-plus 0.1.24

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-53633 updated cvss 8.1

@vitest/browser: vite-plus: Vitest: Remote code execution via exposed Chrome DevTools Protocol API

  • Red Hat Trusted Artifact Signer rhtas/rhtas-console-ui-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
total
Assessed
3 mo ago

Exploit prediction

0.90% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm @vitest/browser
>=5.0.0-beta.0, <5.0.0-beta.4
>=4.0.0, <4.1.8
>=3.0.0, <3.2.5
5.0.0-beta.4
4.1.8
3.2.5
npm vite-plus
<0.1.24
0.1.24

Affected products

  • vitest-dev vitest

Classification

Weakness
  • CWE-749 Exposed Dangerous Method or Function
  • CWE-862 Missing Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.