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Public proof of conceptFix available

CVE-2026-39363

A public proof of concept exists; no exploitation attested.

  • Published2026-04-07
  • WeaknessCWE-1220 · CWE-200 · CWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-0720:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-39363?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-39363?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Vitejs vite
BranchAffectedFixed in
6.x≥ 6.0.0, ≤ 6.4.1no fix published
7.x≥ 7.0.0, ≤ 7.3.1no fix published
8.0≥ 8.0.0, ≤ 8.0.4no fix published
Voidzero vite\+
BranchAffectedFixed in
0.1≤ 0.1.15no fix published
vite
BranchAffectedFixed in
6.x≥ 6.0.0, < 6.4.26.4.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-39363 Red Hat Product Security10 products fixed · 9 known affected

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

    ansible-automation-platform-26/gateway-rhel9 as a component of Red Hat Ansible Automation Platform 2 · ansible-automation-platform-26/mcp-server-rhel9 as a component of Red Hat Ansible Automation Platform 2 · automation-controller.src as a component of Red Hat Ansible Automation Platform 2 · +6 more

  • RHSA-2026:59153 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.7 Container Release Update

  • RHSA-2026:24866 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Container Release Update

  • RHSA-2026:24761 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.5 Product Security and Bug Fix Update

  • RHSA-2026:24762 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:59153 · 2 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.7#Upgrade
  2. Vendor fix Red Hat Product Security RHSA-2026:24866 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_ansible_automation_platform/2.6#Upgrade
  3. Vendor fix Red Hat Product Security RHSA-2026:24761 · 2 productsFor details on how to apply this update, refer to Ansible Automation Platform documentation.
  4. Workaround from the vendor Red Hat Product Security RHSA-2026:59153 · 62 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
  5. No fix available, says the vendor Red Hat Product Security CVE-2026-39363 · 6 productsAffected
  6. No fix planned, says the vendor Red Hat Product Security CVE-2026-39363 · 3 productsWill not fix

Advisories and patches

Detection

read 2026-10-23 19:25 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
3 repositories, unverifiedFirebasky/CVE-2026-39363f4s1on/CVE-2026-39363sunynov/CVE-2026-39363
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionpoc2026-04-08
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.08.2read 2026-10-23
  • CNACVSS 3.17.5read 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-1220, CWE-200, CWE-306read 2026-10-23
  • FIRST EPSSEPSS score2.6 %2026-10-22
  • PoC-in-GitHubproof of concept3read 2026-10-23
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 4.0 vector
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
Published
2026-04-07
Last Modified
2026-08-25
NVD status
Modified

Frequently asked questions

What is CVE-2026-39363?

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.

Is CVE-2026-39363 actively exploited?

A proof-of-concept exploit exists for CVE-2026-39363, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-39363?

CVE-2026-39363 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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