CVE-2026-39363

8.2

HIGH CVSS 4.0

Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

Overview

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.

Details

INFO

Published Date :

April 7, 2026, 8:16 p.m.

Last Modified :

April 30, 2026, 6:34 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-39363 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Vitejs	vite
2	Vitejs	vite-plus
1	Voidzero	vite\+

: Total Affected Vendor : 2 | Products : 3

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				[email protected]
	CVSS 4.0	HIGH				[email protected]

Solution

Update Vite to version 6.4.2, 7.3.2, or 8.0.5 to fix arbitrary file retrieval.

Update Vite to a patched version.
Verify WebSocket origin header enforcement.
Review file access control settings.
Apply vendor security updates promptly.

Public PoC/Exploit Available at Github

CVE-2026-39363 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-39363.

URL	Resource
https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583	Exploit Vendor Advisory
https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583	Exploit Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-39363 is associated with the following CWEs:

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

CWE-306: Missing Authentication for Critical Function

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-39363 weaknesses.

CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-116: Excavation Excavation CAPEC-169: Footprinting Footprinting CAPEC-224: Fingerprinting Fingerprinting CAPEC-285: ICMP Echo Request Ping ICMP Echo Request Ping CAPEC-287: TCP SYN Scan TCP SYN Scan CAPEC-290: Enumerate Mail Exchange (MX) Records Enumerate Mail Exchange (MX) Records CAPEC-291: DNS Zone Transfers DNS Zone Transfers CAPEC-292: Host Discovery Host Discovery CAPEC-293: Traceroute Route Enumeration Traceroute Route Enumeration CAPEC-294: ICMP Address Mask Request ICMP Address Mask Request CAPEC-295: Timestamp Request Timestamp Request CAPEC-296: ICMP Information Request ICMP Information Request CAPEC-297: TCP ACK Ping TCP ACK Ping CAPEC-298: UDP Ping UDP Ping CAPEC-299: TCP SYN Ping TCP SYN Ping CAPEC-300: Port Scanning Port Scanning CAPEC-301: TCP Connect Scan TCP Connect Scan CAPEC-302: TCP FIN Scan TCP FIN Scan CAPEC-303: TCP Xmas Scan TCP Xmas Scan CAPEC-304: TCP Null Scan TCP Null Scan CAPEC-305: TCP ACK Scan TCP ACK Scan CAPEC-306: TCP Window Scan TCP Window Scan CAPEC-307: TCP RPC Scan TCP RPC Scan CAPEC-308: UDP Scan UDP Scan CAPEC-309: Network Topology Mapping Network Topology Mapping CAPEC-310: Scanning for Vulnerable Software Scanning for Vulnerable Software CAPEC-312: Active OS Fingerprinting Active OS Fingerprinting CAPEC-313: Passive OS Fingerprinting Passive OS Fingerprinting CAPEC-317: IP ID Sequencing Probe IP ID Sequencing Probe CAPEC-318: IP 'ID' Echoed Byte-Order Probe IP 'ID' Echoed Byte-Order Probe CAPEC-319: IP (DF) 'Don't Fragment Bit' Echoing Probe IP (DF) 'Don't Fragment Bit' Echoing Probe CAPEC-320: TCP Timestamp Probe TCP Timestamp Probe CAPEC-321: TCP Sequence Number Probe TCP Sequence Number Probe CAPEC-322: TCP (ISN) Greatest Common Divisor Probe TCP (ISN) Greatest Common Divisor Probe CAPEC-323: TCP (ISN) Counter Rate Probe TCP (ISN) Counter Rate Probe CAPEC-324: TCP (ISN) Sequence Predictability Probe TCP (ISN) Sequence Predictability Probe CAPEC-325: TCP Congestion Control Flag (ECN) Probe TCP Congestion Control Flag (ECN) Probe CAPEC-326: TCP Initial Window Size Probe TCP Initial Window Size Probe CAPEC-327: TCP Options Probe TCP Options Probe CAPEC-328: TCP 'RST' Flag Checksum Probe TCP 'RST' Flag Checksum Probe CAPEC-329: ICMP Error Message Quoting Probe ICMP Error Message Quoting Probe CAPEC-330: ICMP Error Message Echoing Integrity Probe ICMP Error Message Echoing Integrity Probe CAPEC-472: Browser Fingerprinting Browser Fingerprinting CAPEC-497: File Discovery File Discovery CAPEC-508: Shoulder Surfing Shoulder Surfing CAPEC-573: Process Footprinting Process Footprinting CAPEC-574: Services Footprinting Services Footprinting CAPEC-575: Account Footprinting Account Footprinting CAPEC-576: Group Permission Footprinting Group Permission Footprinting CAPEC-577: Owner Footprinting Owner Footprinting CAPEC-616: Establish Rogue Location Establish Rogue Location CAPEC-643: Identify Shared Files/Directories on System Identify Shared Files/Directories on System CAPEC-646: Peripheral Footprinting Peripheral Footprinting CAPEC-651: Eavesdropping Eavesdropping CAPEC-12: Choosing Message Identifier Choosing Message Identifier CAPEC-36: Using Unpublished Interfaces or Functionality Using Unpublished Interfaces or Functionality CAPEC-62: Cross Site Request Forgery Cross Site Request Forgery CAPEC-166: Force the System to Reset Values Force the System to Reset Values CAPEC-216: Communication Channel Manipulation Communication Channel Manipulation

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Nate-Carroll-Cyber/Cyber-Spy.ai-prod

Private staging repository for Counter-Spy/Cyber-Spy documentation and future code split.

Updated: 6 days, 14 hours ago

0 stars 0 fork 0 watcher

Born at : April 21, 2026, 5:47 p.m. This repo has been linked 4 different CVEs too.

Firebasky/CVE-2026-39363

CVE-2026-39363 AI analysis

Python HTML JavaScript CSS

Updated: 3 weeks ago

5 stars 0 fork 0 watcher

Born at : April 8, 2026, 3:31 p.m. This repo has been linked 1 different CVEs too.

dbeaver/cloudbeaver

Cloud Database Manager

webapp dbeaver databases database cloud-database-manager cloud

Batchfile Shell Java HTML JavaScript TypeScript CSS Dockerfile SCSS EJS

Updated: 6 days, 22 hours ago

4824 stars 524 fork 524 watcher

Born at : April 9, 2020, 4:39 p.m. This repo has been linked 12 different CVEs too.

nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 6 days, 9 hours ago

7667 stars 1247 fork 1247 watcher

Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 749 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-39363 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-39363 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Reanalysis by [email protected]

Apr. 30, 2026

Action	Type	Old Value	New Value
Changed	CPE Configuration	OR cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 6.0.0 up to (including) 6.4.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 7.0.0 up to (including) 7.3.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 8.0.0 up to (including) 8.0.4 cpe:2.3:a:vitejs:vite-plus::::::node.js:: versions up to (including) 0.1.15	OR cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 6.0.0 up to (including) 6.4.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 7.0.0 up to (including) 7.3.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 8.0.0 up to (including) 8.0.4 cpe:2.3:a:voidzero:vite+::::::node.js:: versions up to (including) 0.1.15

Initial Analysis by [email protected]

Apr. 15, 2026

Action	Type	New Value
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Added	CPE Configuration	OR cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 6.0.0 up to (including) 6.4.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 7.0.0 up to (including) 7.3.1 cpe:2.3:a:vitejs:vite::::::node.js:: versions from (including) 8.0.0 up to (including) 8.0.4 cpe:2.3:a:vitejs:vite-plus::::::node.js:: versions up to (including) 0.1.15
Added	Reference Type	GitHub, Inc.: https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 Types: Exploit, Vendor Advisory
Added	Reference Type	CISA-ADP: https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583 Types: Exploit, Vendor Advisory

CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Apr. 08, 2026

Action	Type	Old Value	New Value
Added	Reference		https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583

New CVE Received by [email protected]

Apr. 07, 2026

Action	Type	New Value
Added	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.
Added	CVSS V4.0	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
Added	CWE	CWE-200
Added	CWE	CWE-306
Added	Reference	https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.