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.
Affected products
vitejs: vite; voidzero: vite\+
References9
- github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 ExploitVendor Advisory
- github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 ExploitVendor Advisory
- access.redhat.com/errata/RHSA-2026:24761
- access.redhat.com/errata/RHSA-2026:24762
- access.redhat.com/errata/RHSA-2026:24866
- access.redhat.com/errata/RHSA-2026:59153
- access.redhat.com/security/cve/CVE-2026-39363
- bugzilla.redhat.com/show_bug.cgi?id=2456179
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39363…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 4.0
-
8.2
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 3% percentile: 89 · as of 12 November 2026
- CWE
- CWE-200CWE-306CWE-1220
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.