SB2025120158 - Prototype pollution in Express.js
Published: December 1, 2025
Security Bulletin ID
SB2025120158
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Prototype pollution (CVE-ID: CVE-2024-51999)
The vulnerability allows a remote attacker to execute arbitrary JavaScript code.
The vulnerability exists due to improper input validation when using the extended query parser in express ('query parser': 'extended'). A remote attacker can pass specially crafted input to the application and perform prototype pollution, which can result in information disclosure or data manipulation.
Remediation
Install update from vendor's website.