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Fencer Intel
high 7.5

CVE-2026-39363 json

Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

published 7mo ago modified last mo. also GHSA-p9ff-h696-f583 , EUVD-2026-19871

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • npm vite 6.4.2, 7.3.2, 8.0.5
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8 0:2.5.20260422-3.el8ap
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9 0:2.5.20260422-3.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 0:2.6.9-1.el9ap
  • Red Hat Red Hat Ansible Automation Platform 2.6 1779783248
  • Red Hat Red Hat Ansible Automation Platform 2.7 1787218409
  • receptor ansible automation platform 2.6 1.6.5-1.el10ap
  • receptor ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 1.6.5-1.el9ap
  • receptorctl ansible automation platform 2.6 1.6.5-1.el10ap
  • receptorctl ansible automation platform inside 2.6, ansible automation platform developer 2.6, ansible automation platform 2.6 1.6.5-1.el9ap
  • python3-click ansible automation platform developer 2.6, ansible automation platform 2.6 8.3.3-1.el10ap
  • python3.12-click ansible automation platform inside 2.6, ansible automation platform inside 2.5, ansible automation platform developer 2.6 +3 more 8.3.3-1.el9ap
  • python3.12-pillow ansible automation platform 2.6, ansible automation platform 2.5 12.2.0-1.el9ap
  • automation-controller ansible automation platform developer 2.6, ansible automation platform 2.6 4.7.12-1.el9ap

red hat advisories RHSA-2026:24762RHSA-2026:24761

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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-2026-39363 updated cvss 7.5

Vite: Vite: Information disclosure via WebSocket connection bypasses access control

  • Red Hat Ansible Automation Platform 2 automation-controller, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-26/mcp-server-rhel9
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Build of Keycloak vite
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Build of Podman Desktop podman-desktop-macos-1-0, podman-desktop-windows-1-0
    affected: workaround, no fix available
  • Red Hat Build of Podman Desktop - Tech Preview redhat-user-workloads/red-hat-desktop-tenant/rhel-ext, redhat-user-workloads/red-hat-desktop-tenant/bootc-ext, redhat-user-workloads/red-hat-desktop-tenant/openshift-local-ext
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Ansible Automation Platform 2.5 for RHEL 8 automation-gateway-server 2.5.20260422-3.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 automation-gateway-server 2.5.20260422-3.el9ap
    fixed: vendor fix RHSA-2026:24761
  • Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-tech-preview/mcp-server-rhel9 1779783248
    fixed: vendor fix RHSA-2026:24866
  • Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-platform-ui 2.6.9-1.el9ap
    fixed: vendor fix RHSA-2026:24762
  • Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/gateway-rhel9 1787218409
    fixed: vendor fix RHSA-2026:59153
show 2 more
  • Red Hat Advanced Cluster Security 4 rhacs-eng/release-main Red Hat Ansible Automation Platform 2 automation-eda-controller Red Hat Ansible Automation Platform 2.5 for RHEL 8 receptor 1.6.5-1.el8ap, receptorctl 1.6.5-1.el8ap, automation-hub 4.10.15-1.el8ap, python3.12-click 8.3.3-1.el8ap, python3.12-pillow 12.2.0-1.el8ap, python3.12-pulpcore 3.49.61-1.el8ap, +12 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 receptor 1.6.5-1.el9ap, receptorctl 1.6.5-1.el9ap, automation-hub 4.10.15-1.el9ap, python3.12-click 8.3.3-1.el9ap, python3.12-pillow 12.2.0-1.el9ap, python3.12-pulpcore 3.49.61-1.el9ap, +12 more Red Hat Ansible Automation Platform 2.6 ansible-automation-platform-26/hub-rhel9 1779761061, ansible-automation-platform-26/gateway-rhel9 1779773804, ansible-automation-platform-26/hub-web-rhel9 1779765164, ansible-automation-platform-26/receptor-rhel9 1779770938, ansible-automation-platform-26/mcp-tools-rhel9 1779772877, ansible-automation-platform-26/controller-rhel9 1779762270, +23 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 receptor 1.6.5-1.el9ap, molecule 26.4.0-2.el9ap, receptorctl 1.6.5-1.el9ap, ansible-sign 0.1.5-1.el9ap, ansible-lint 26.4.0-1.el9ap, automation-hub 4.11.9-1.el9ap, +37 more
    +4 more products
    Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.5-1.el10ap, molecule 26.4.0-2.el10ap, receptorctl 1.6.5-1.el10ap, ansible-sign 0.1.5-1.el10ap, python-click 8.3.3-1.el10ap, ansible-lint 26.4.0-1.el10ap, +12 more Red Hat Ansible Automation Platform 2.7 ansible-automation-platform-27/hub-rhel9 1787223293, ansible-automation-platform-27/hub-web-rhel9 1787225966, ansible-automation-platform-27/receptor-rhel9 1787216969, ansible-automation-platform-27/mcp-tools-rhel9 1787218205, ansible-automation-platform-27/controller-rhel9 1787220257, ansible-automation-platform-27/de-minimal-rhel9 1787224014, +25 more Red Hat JBoss Enterprise Application Platform 8 vite Red Hat JBoss Enterprise Application Platform Expansion Pack vite
    not affected: vulnerable code not present
  • Red Hat OpenShift Container Platform 4 redhat-user-workloads/ocp-art-tenant/art-images
    not affected: component 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
partial
Assessed
7mo ago

Exploit prediction

3.40% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Nuclei template Vite Dev Server - Arbitrary File Read nuclei detection template
  • github.com https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.2 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
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 4.0 8.2 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
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
npm vite
>=8.0.0, <8.0.5
>=7.0.0, <7.3.2
>=6.0.0, <6.4.2
8.0.5
7.3.2
6.4.2

Affected products

  • vitejs vite
  • vitejs vite-plus
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 8
  • Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9
  • Red Hat Red Hat Ansible Automation Platform 2.6
  • Red Hat Red Hat Ansible Automation Platform 2.7
  • Red Hat Red Hat Advanced Cluster Security 4
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat Build of Podman Desktop
  • Red Hat Red Hat Build of Podman Desktop - Tech Preview
  • Red Hat Red Hat JBoss Enterprise Application Platform 8
  • Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-306 Missing Authentication for Critical Functionality
  • CWE-1220 Insufficient Granularity of Access Control

References

Sources

Fencer Intel 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.