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NVD / CVE Program· CNA GitHub_M

CVE-2026-39363: Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

HighCVSS 8.2 · v4.0—Proof of concept Fix available

Noroxi assessment

Priority: Monitor (action score 33/100)

  • A ready-made attack module is public (Nuclei); exploiting it takes no special expertise.
  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 3.3% (FIRST EPSS); higher than 89% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: vitejs vite 6.4.2.

Low priority for now. Upgrade to vitejs vite 6.4.2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Apr 7, 2026
Updated
Aug 25, 2026
EPSS
3.3% · 89th percentile

Report tools

JSON

Action score

33

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 3.3%

CISA SSVC decision

Exploitation
proof of concept
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
8.2
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
vitejsvite
voidzerovite\+

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • vitejs vite

    • >= 8.0.0, < 8.0.5, >= 7.0.0, < 7.3.2, >= 6.0.0, < 6.4.2affected

  • vitejs vite-plus

    • < 0.1.16affected
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • vitejs vite6.0.0 and later · up to 6.4.1 inclusive
  • vitejs vite7.0.0 and later · up to 7.3.1 inclusive
  • vitejs vite8.0.0 and later · up to 8.0.4 inclusive
  • voidzero vite+up to 0.1.15 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
npmvitefrom 6.0.0 · before 6.4.26.4.2
npmvitefrom 7.0.0 · before 7.3.27.3.2
npmvitefrom 8.0.0 · before 8.0.58.0.5
Red Hat:ansible_automation_platform_developer:2.5::el8python3.12-clickbefore 0:8.3.3-1.el8ap0:8.3.3-1.el8ap
Red Hat:ansible_automation_platform_developer:2.5::el8python3.12-cryptographybefore 0:46.0.7-1.el8ap0:46.0.7-1.el8ap
Red Hat:ansible_automation_platform_developer:2.5::el8receptorbefore 0:1.6.5-1.el8ap0:1.6.5-1.el8ap
Red Hat:ansible_automation_platform_developer:2.5::el9python3.12-clickbefore 0:8.3.3-1.el9ap0:8.3.3-1.el9ap
Red Hat:ansible_automation_platform_developer:2.5::el9python3.12-cryptographybefore 0:46.0.7-1.el9ap0:46.0.7-1.el9ap
Red Hat:ansible_automation_platform_developer:2.5::el9receptorbefore 0:1.6.5-1.el9ap0:1.6.5-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el10python3-clickbefore 0:8.3.3-1.el10ap0:8.3.3-1.el10ap
Red Hat:ansible_automation_platform_developer:2.6::el9automation-controllerbefore 0:4.7.12-1.el9ap0:4.7.12-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9automation-controller-clibefore 0:4.7.12-1.el9ap0:4.7.12-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9python3.12-cryptography-debuginfobefore 0:46.0.7-1.el9ap0:46.0.7-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9python3.12-cryptography-debugsourcebefore 0:46.0.7-1.el9ap0:46.0.7-1.el9ap
Red Hat:ansible_automation_platform_developer:2.6::el9receptorctlbefore 0:1.6.5-1.el9ap0:1.6.5-1.el9ap
Red Hat:ansible_automation_platform:2.5::el8automation-controller-venv-towerbefore 0:4.6.29-2.el8ap0:4.6.29-2.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-proxy-serverbefore 0:2.5.10-6.el8ap0:2.5.10-6.el8ap
Red Hat:ansible_automation_platform:2.5::el8automation-gateway-serverbefore 0:2.5.20260422-3.el8ap0:2.5.20260422-3.el8ap
Red Hat:ansible_automation_platform:2.5::el8python3.12-pillowbefore 0:12.2.0-1.el8ap0:12.2.0-1.el8ap
Red Hat:ansible_automation_platform:2.5::el9automation-controller-venv-towerbefore 0:4.6.29-2.el9ap0:4.6.29-2.el9ap
Red Hat:ansible_automation_platform:2.5::el9automation-gateway-proxy-serverbefore 0:2.6.14-3.el9ap0:2.6.14-3.el9ap
Red Hat:ansible_automation_platform:2.5::el9automation-gateway-serverbefore 0:2.5.20260422-3.el9ap0:2.5.20260422-3.el9ap
Red Hat:ansible_automation_platform:2.5::el9python3.12-pillowbefore 0:12.2.0-1.el9ap0:12.2.0-1.el9ap
Red Hat:ansible_automation_platform:2.6::el10receptorbefore 0:1.6.5-1.el10ap0:1.6.5-1.el10ap

+14

Same product

vitejs: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-31125Vite has a `server.fs.deny` bypassed for `inline` and `raw` with `?import` queryKEV
    82Now
  • CVE-2025-30208Vite bypasses server.fs.deny when using `?raw??`
    52Plan
  • CVE-2026-39364Vite has a `server.fs.deny` bypass with queries
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-58752Sep 8, 2025 · Vite's `server.fs` settings were not applied to HTML files
    9Monitor
  • ← EarlierCVE-2025-62522Oct 20, 2025 · vite allows server.fs.deny bypass via backslash on Windows
    24Monitor
  • Later →CVE-2026-39365Apr 7, 2026 · Vite has a Path Traversal in Optimized Deps `.map` Handling
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
vitejs vite6.4.2 · descriptionVendor (CNA)
npm:vite6.4.2Package registry (OSV)
npm:vite7.3.2Package registry (OSV)
npm:vite8.0.5Package registry (OSV)
red hat:automation-controller0:4.7.12-1.el9ap · Red Hat:ansible_automation_platform_developer:2.6::el9Package registry (OSV)
red hat:automation-controller-cli0:4.7.12-1.el9ap · Red Hat:ansible_automation_platform_developer:2.6::el9Package registry (OSV)
red hat:automation-controller-server0:4.7.12-1.el9ap · Red Hat:ansible_automation_platform:2.6::el9Package registry (OSV)
red hat:automation-controller-venv-tower0:4.6.29-2.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-gateway-proxy-server0:2.5.10-6.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-gateway-server0:2.5.20260422-3.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:automation-platform-ui0:2.6.9-1.el9ap · Red Hat:ansible_automation_platform:2.6::el9Package registry (OSV)
red hat:python3-click0:8.3.3-1.el10ap · Red Hat:ansible_automation_platform_developer:2.6::el10Package registry (OSV)
red hat:python3.12-click0:8.3.3-1.el8ap · Red Hat:ansible_automation_platform_developer:2.5::el8Package registry (OSV)
red hat:python3.12-cryptography0:46.0.7-1.el8ap · Red Hat:ansible_automation_platform_developer:2.5::el8Package registry (OSV)
red hat:python3.12-pillow0:12.2.0-1.el8ap · Red Hat:ansible_automation_platform:2.5::el8Package registry (OSV)
red hat:receptor0:1.6.5-1.el8ap · Red Hat:ansible_automation_platform_developer:2.5::el8Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Nuclei detection template ×1
  • Proof-of-concept repository on GitHub ×3

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHub3 repositories2026-04-08 → 2026-08-04
Nuclei detection templateNuclei template CVE-2026-39363 —

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. First PoCsame day
  3. TodayNov 14, 2026+220 d

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-31125372 days apartVite has a `server.fs.deny` bypassed for `inline` and `raw` with `?import` queryKEV
    82Now
  • CVE-2025-30208379 days apartVite bypasses server.fs.deny when using `?raw??`
    52Plan
  • CVE-2025-31486369 days apartVite allows server.fs.deny to be bypassed with .svg or relative paths
    33Monitor
  • CVE-2025-32395362 days apartVite has an `server.fs.deny` bypass with an invalid `request-target`
    25Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS 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

nvd-secondary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records