SB2025052970 - Missing WebSocket origin validation in Next.js
Published: May 29, 2025
Security Bulletin ID
SB2025052970
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing Origin Validation in WebSockets (CVE-ID: CVE-2025-48068)
CWE-ID: CWE-1385 - Missing Origin Validation in WebSockets
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to missing origin validation on the WebSocket interface if the project uses the App Router. When running next dev, a malicious website can open a WebSocket connection to localhost and access component source code.
Remediation
Install update from vendor's website.