EUVD-2026-10562

Comprehensive Technical Analysis of EUVD-2026-10562

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2026-10562 affects OneUptime, a solution for monitoring and managing online services. The issue allows a low-privileged authenticated project user to execute arbitrary commands on the oneuptime-probe server/container. This is a server-side remote code execution (RCE) vulnerability, which is particularly severe due to its potential for complete system compromise.

Severity Evaluation:

• CVSS Base Score: 10.0 (Critical)
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  • 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)

The high CVSS score indicates that this vulnerability is extremely critical and poses a significant risk to affected systems.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated Low-Privileged User: An attacker with low-privileged access to the OneUptime project can exploit this vulnerability.
• Synthetic Monitor Code Execution: The attacker can inject malicious code into the Synthetic Monitor, which is executed inside Node's vm.

Exploitation Methods:

• Playwright API Calls: The attacker can call Playwright APIs on the injected browser object, leading to the execution of arbitrary commands.
• Spawning Executables: The attacker can cause the probe to spawn an attacker-controlled executable, leading to RCE.

3. Affected Systems and Software Versions

Affected Systems:

• OneUptime versions prior to 10.0.21.

Software Versions:

• All versions of OneUptime before 10.0.21 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade to the Latest Version: Upgrade OneUptime to version 10.0.21 or later, which includes the fix for this vulnerability.
• Access Control: Restrict access to the OneUptime project to trusted users only.
• Monitoring: Implement enhanced monitoring for suspicious activities, especially around Synthetic Monitor code execution.

Long-Term Strategies:

• Code Review: Conduct thorough code reviews to ensure that untrusted code is not executed in a privileged context.
• Security Training: Provide security training for developers to avoid similar vulnerabilities in the future.
• Regular Updates: Ensure that all software components are regularly updated to the latest versions.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations using OneUptime for monitoring and managing their online services. Given the critical nature of the vulnerability, it could lead to widespread compromise of systems, data breaches, and service disruptions. This underscores the importance of timely patching and robust security practices within the European cybersecurity landscape.

6. Technical Details for Security Professionals

Root Cause:

• The vulnerability arises from the execution of untrusted Synthetic Monitor code inside Node's vm while live host-realm Playwright browser and page objects are exposed to it.

Technical Explanation:

• Node's vm: The Node.js virtual machine (vm) module is used to run JavaScript code in a sandboxed environment. However, in this case, the sandbox is not effectively isolating the untrusted code.
• Playwright APIs: Playwright is a framework for end-to-end testing of web applications. The exposure of Playwright browser and page objects allows the attacker to interact with the browser context and execute arbitrary commands.

Mitigation Implementation:

• Code Sandboxing: Ensure that untrusted code is executed in a properly sandboxed environment that does not have access to sensitive APIs or system resources.
• Input Validation: Implement robust input validation and sanitization for all user-provided data, especially in Synthetic Monitor code.
• Least Privilege: Apply the principle of least privilege to ensure that users have the minimum level of access necessary to perform their tasks.

References:

• OneUptime Security Advisory
• OneUptime Release Notes

By addressing this vulnerability promptly and implementing the recommended mitigation strategies, organizations can significantly reduce the risk of exploitation and ensure the security of their online services.