CVE-2026-39363 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-39363HIGH

vitejs vite — Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   H   N   N    8.2   .0332   87.6     —

AFFECTED
  Product    Versions             Fixed
  vite       >= 8.0.0, < 8.0.5 –  —
  vite-plus  < 0.1.16 –           —

TIMELINE
  Apr 6   Reserved by GitHub_M
  Apr 7   Published (CNA: GitHub_M)
  Aug 4   EXPLOIT PUBLISHED — CVE-2026-39363 (vitejs vite). Public exploit reference added.

CWE-200, CWE-306 · CNA: GitHub_M · CVSS v4.0 · 7 references · NVD status: Modified

Description

Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, if it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "..."). The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 6, 2026	Reserved	Reserved by GitHub_M
April 7, 2026	Published	Published (CNA: GitHub_M)
August 4, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-39363 (vitejs vite). Public exploit reference added.

Affected

Affected products and packages — 2 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
vitejs	vite	—	>= 8.0.0, < 8.0.5	—
vitejs	vite-plus	—	< 0.1.16	—

Weaknesses

CWE-200 · CWE-306

References (7)

https://access.redhat.com/errata/RHSA-2026:24761 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:24762 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/errata/RHSA-2026:24866 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2026-39363 [vdb-entry, x_refsource_REDHAT]
https://bugzilla.redhat.com/show_bug.cgi?id=2456179 [issue-tracking, x_refsource_REDHAT]
https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 [x_refsource_CONFIRM]
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39363.json [x_sadp-csaf-vex]

Authoritative record: CVE-2026-39363 at cve.org

Vendors: vitejs

Weaknesses: CWE-200 · CWE-306

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-39363 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.