CVE-2025-23061: Mongoosejs Mongoose SQLi Vulnerability

CVE-2025-23061 Overview

CVE-2025-23061 is a search injection vulnerability in Mongoose, the popular MongoDB object modeling library for Node.js. The vulnerability exists in versions prior to 8.9.5 and allows attackers to exploit improper handling of nested $where filters when used in conjunction with populate() match operations. This issue represents an incomplete fix for the previously identified CVE-2024-53900.

Critical Impact

Successful exploitation could allow attackers to execute arbitrary JavaScript code within MongoDB queries, potentially leading to unauthorized data access, data manipulation, or complete database compromise in affected Node.js applications.

Affected Products

• Mongoose versions prior to 8.9.5 for Node.js
• mongoosejs mongoose (all vulnerable versions)
• Applications using Mongoose with populate() and nested query filters

Discovery Timeline

• 2025-01-15 - CVE CVE-2025-23061 published to NVD
• 2025-10-31 - Last updated in NVD database

Technical Details for CVE-2025-23061

Vulnerability Analysis

This search injection vulnerability (CWE-94: Code Injection) occurs when Mongoose improperly processes nested $where filters within populate() match operations. The $where operator in MongoDB allows execution of JavaScript expressions as part of queries, which when combined with user-controllable input in nested structures, creates a dangerous injection point.

The vulnerability is particularly concerning because it bypasses the incomplete sanitization implemented to address CVE-2024-53900. Attackers who can influence query parameters may inject malicious JavaScript code that executes within the context of MongoDB's query engine.

Root Cause

The root cause lies in insufficient input validation and sanitization when processing nested filter objects containing the $where operator. When a populate() call includes a match parameter with nested objects, the library fails to properly sanitize or reject dangerous operators like $where at deeper nesting levels. This oversight allows malicious payloads to slip through the security controls that were intended to prevent such injection attacks.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker can craft malicious input that gets passed to Mongoose query operations, specifically targeting applications that:

1. Accept user input that influences populate() match criteria
2. Use nested query structures in their data retrieval logic
3. Run vulnerable versions of Mongoose (prior to 8.9.5)

The vulnerability is exploited by constructing a query object with a nested $where clause that bypasses input validation. When this query is processed by Mongoose's populate() function, the malicious JavaScript in the $where clause is executed by MongoDB's query engine.

Since no verified code examples are available, detailed exploitation techniques can be found in the Mongoose commit log that addresses this vulnerability.

Detection Methods for CVE-2025-23061

Indicators of Compromise

• Unusual query patterns in MongoDB logs containing $where operators in nested structures
• Application errors related to malformed populate queries or unexpected JavaScript execution
• Unexpected data access patterns or unauthorized read operations in database audit logs
• Presence of JavaScript code snippets in HTTP request parameters or JSON payloads targeting API endpoints

Detection Strategies

• Implement application-level logging to capture all Mongoose queries, specifically monitoring for $where usage
• Deploy Web Application Firewall (WAF) rules to detect and block requests containing $where in nested JSON structures
• Use SentinelOne's Runtime Application Self-Protection (RASP) capabilities to monitor for injection attempts in Node.js applications
• Conduct regular dependency audits using npm audit to identify vulnerable Mongoose versions

Monitoring Recommendations

• Enable MongoDB query logging and monitor for queries containing $where operators
• Set up alerts for unusual database query patterns or execution errors
• Monitor network traffic for suspicious payloads targeting Node.js application endpoints
• Implement centralized logging to correlate application and database events for injection attack detection

How to Mitigate CVE-2025-23061

Immediate Actions Required

• Upgrade Mongoose to version 8.9.5 or later immediately
• Audit application code for usage of populate() with user-controllable match parameters
• Implement strict input validation to reject queries containing $where operators
• Consider temporarily disabling functionality that uses populate() with dynamic filters until patching is complete

Patch Information

The vulnerability has been addressed in Mongoose version 8.9.5. The fix is documented in the GitHub Mongoose Changelog and the specific commit can be reviewed at commit 64a9f9706f2428c49e0cfb8e223065acc645f7bc. The release is available via NPM and the GitHub release tag.

Workarounds

• Implement a middleware layer that strips or rejects $where operators from all incoming query parameters
• Use allowlist-based input validation to only permit known-safe query operators
• Consider using MongoDB's aggregation pipeline instead of $where for complex queries
• Apply the principle of least privilege to database connections used by the application

# Upgrade Mongoose to patched version
npm update mongoose@8.9.5

# Or install specific version
npm install mongoose@8.9.5 --save

# Verify installed version
npm list mongoose