CVE-2026-39363: Vite is a frontend tooling framework for JavaScript

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HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2026-39363 is a high-severity flaw (CVSS 7.5) affecting vite, vite\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 enforce

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.4% (top 11%)
CISA exploited list	No
Weakness	CWE-200, CWE-306, CWE-1220
Published	2026-04-07
Last modified	2026-08-25

Publisher (CNA): GitHub, Inc. · Vendor: vitejs · voidzero

Last updated 2026-08-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-07 20:16 UTCPublished CVE record published
2026-08-25 13:18 UTCUpdated Record last modified

vitejs vite UPGRADE

Affected: >= 6.0.0 and <= 6.4.1 · >= 7.0.0 and <= 7.3.1 · >= 8.0.0 and <= 8.0.4

Fixed in: newer than 8.0.4

Safe to downgrade to: a release before 6.0.0

1. Check installed version

npm ls vite

2. UPGRADE to newer than 8.0.4

npm install vite@">8.0.4"

3. If no update is available yet, DOWNGRADE to a release before 6.0.0

npm view vite versions npm install vite@"<6.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

voidzero vite\+ UPGRADE

Affected: <= 0.1.15

Fixed in: newer than 0.1.15

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls vite+

2. UPGRADE to newer than 0.1.15

npm install vite+@">0.1.15"

Exact fixes by distribution

npm · vite · FIXED · 8.0.5 · vulnerable: >= 8.0.0, <= 8.0.4 · source

npm install vite@">=8.0.5" npm ls vite

Fedora 46 · python-googleapis-common-protos · FIXED · 1.75.5-1.fc46~bootstrap · FEDORA-2026-d911c4c4e6 · source

sudo dnf upgrade --advisory=FEDORA-2026-d911c4c4e6

Fedora ELN · see advisory · FIXED · FEDORA-2026-e3987c278f · source

sudo dnf upgrade --advisory=FEDORA-2026-e3987c278f

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: Firebasky/CVE-2026-39363 (7 stars)
GitHub PoC: f4s1on/CVE-2026-39363 (0 stars)
GitHub PoC: sunynov/CVE-2026-39363 (0 stars)
Write-up: github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583
Nuclei scan template: Vite Dev Server - Arbitrary File Read

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39363?

vite: upgrade to newer than 8.0.4; vite\+: upgrade to newer than 0.1.15. Exact commands for each OS are on this page.

Is CVE-2026-39363 being exploited?

CVE-2026-39363 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39363 affect?

CVE-2026-39363 affects vite, vite\+. Severity is high (CVSS 7.5). 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 W

How urgent is CVE-2026-39363?

Priority 58/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-53571 HIGH 7.5 UPGRADE UPGRADE Vite is a frontend tooling framework for JavaScript
CVE-2026-39364 HIGH 7.5 UPGRADE UPGRADE Vite is a frontend tooling framework for JavaScript
CVE-2026-39365 MEDIUM 5.3 UPGRADE UPGRADE Vite is a frontend tooling framework for JavaScript

References

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