CVE-2023-34092: Vite Server Options (server.fs.deny) can be bypassed using double forward-slash (//)

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-06-01 · updated 2026-06-17
Weakness: CWE-50

Description

Vite provides frontend tooling. Prior to versions 2.9.16, 3.2.7, 4.0.5, 4.1.5, 4.2.3, and 4.3.9, Vite Server Options (`server.fs.deny`) can be bypassed using double forward-slash (//) allows any unauthenticated user to read file from the Vite root-path of the application including the default `fs.deny` settings (`['.env', '.env.*', '*.{crt,pem}']`). Only users explicitly exposing the Vite dev server to the network (using `--host` or `server.host` config option) are affected, and only files in the immediate Vite project root folder could be exposed. This issue is fixed in vite@4.3.9, vite@4.2.3, vite@4.1.5, vite@4.0.5, vite@3.2.7, and vite@2.9.16.

Affected products

vitejs vite: from 3.0.2 before 3.2.7; from 4.0.0 before 4.0.5; from 4.1.0 before 4.1.5; from 4.2.0 before 4.2.3; from 4.3.0 before 4.3.9; 2.9.15 — fixed in 3.2.7, 4.0.5, 4.1.5, 4.2.3, 4.3.9

How to fix

Upgrade to a fixed version: vitejs vite 3.2.7, 4.0.5, 4.1.5, 4.2.3. Check the vendor advisory for mitigations.

References

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