EUVD-2026-10420

Comprehensive Technical Analysis of EUVD-2026-10420

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in OneUptime, a monitoring and management solution for online services, allows project members to execute custom Playwright/JavaScript code via Synthetic Monitors. This code is executed within the insecure Node.js vm module, which can be exploited to escape the sandbox and gain access to the underlying Node.js process object. This leads to arbitrary system command execution (Remote Code Execution, RCE) on the oneuptime-probe container.

Severity Evaluation: The vulnerability has a CVSS Base Score of 10.0, indicating a critical severity level. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): Low (L)
• User Interaction (UI): None (N)
• Scope (S): Changed (C)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

This high severity is due to the potential for complete cluster compromise, including access to database/cluster credentials stored in environment variables.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Untrusted Code Execution: An attacker can inject malicious JavaScript code into the Synthetic Monitors feature.
• Prototype-Chain Escape: By leveraging a prototype-chain escape technique (this.constructor.constructor), the attacker can bypass the sandbox and access the Node.js process object.
• Environment Variable Exposure: Once the attacker gains access to the Node.js process object, they can read environment variables containing sensitive credentials.

Exploitation Methods:

• RCE Execution: The attacker can execute arbitrary system commands on the oneuptime-probe container.
• Credential Theft: By accessing environment variables, the attacker can steal database/cluster credentials, leading to a complete cluster compromise.

3. Affected Systems and Software Versions

Affected Systems:

• OneUptime versions prior to 10.0.18.

Software Versions:

• All versions of OneUptime below 10.0.18 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to OneUptime version 10.0.18 or later, which includes the fix for this vulnerability.
• Disable Synthetic Monitors: Temporarily disable the Synthetic Monitors feature until the upgrade is complete.

Long-Term Mitigation:

• Code Review: Conduct a thorough code review to ensure that all user-supplied code is executed in a secure sandbox.
• Environment Variable Management: Implement strict controls over environment variables to prevent exposure of sensitive credentials.
• Monitoring and Logging: Enhance monitoring and logging to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Data Breach: The vulnerability can lead to significant data breaches, including the exposure of sensitive credentials and customer data.
• Service Disruption: The ability to execute arbitrary system commands can result in service disruptions and potential data loss.
• Compliance Risks: Organizations using OneUptime may face compliance risks, particularly under GDPR, if sensitive data is compromised.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure that they comply with GDPR regulations by implementing robust security measures and reporting any data breaches promptly.
• Incident Response: Organizations should have an incident response plan in place to quickly address and mitigate any potential breaches.

6. Technical Details for Security Professionals

Technical Overview:

• Node.js vm Module: The vm module in Node.js is used to execute JavaScript code in a sandboxed environment. However, it is not secure against prototype-chain escapes.
• Prototype-Chain Escape: This technique involves manipulating the prototype chain to access the global object and execute arbitrary code.
• Environment Variables: Sensitive credentials stored in environment variables can be accessed once the sandbox is bypassed.

Detection and Response:

• Intrusion Detection Systems (IDS): Implement IDS to detect unusual network activities and potential exploitation attempts.
• Log Analysis: Regularly analyze logs for any suspicious activities, particularly around the execution of Synthetic Monitors.
• Patch Management: Ensure that all systems are regularly patched and updated to the latest versions.

Conclusion: The vulnerability in OneUptime is critical and requires immediate attention. Organizations should prioritize upgrading to the patched version and implement robust security measures to mitigate the risk of exploitation. The potential impact on the European cybersecurity landscape underscores the importance of proactive security management and compliance with regulatory requirements.