CVE-2025-48068
May 30, 2025
Summary This vulnerability is similar to CVE-2018-14732. When running a Next.js server locally (e.g. through "npm run dev"), the WebSocket server is vulnerable to the Cross-site WebSocket hijacking (CSWSH) attack. and a bad actor can access the source code of client components, if a user was to visit a malicious link while having the Next.js dev server running. Impact If a user is running a Next.js server locally (e.g. "npm run dev"), and they were to browse to a malicious website, the malicious website may be able to access the source code of the Next.js app. This vulnerability only affects applications making use of App Router. Note: App Router was experimental requiring "experimental.appDir = true" in versions ">=13.0.0" to "<13.4".
Affected Packages
https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v13.0.0 <v14.2.30Fix Suggestion:
Update to version v14.2.30https://github.com/vercel/next.js.git (GITHUB):
Affected version(s) >=v15.0.0 <v15.2.2Fix Suggestion:
Update to version v15.2.2next (NPM):
Affected version(s) >=13.0.0 <14.2.30Fix Suggestion:
Update to version 14.2.30next (NPM):
Affected version(s) >=15.0.0 <15.2.2Fix Suggestion:
Update to version 15.2.2Additional Notes
The description of this vulnerability differs from MITRE.
Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Missing Origin Validation in WebSockets
EPSS
Base Score:
0.03
