EUVD-2026-10434

Comprehensive Technical Analysis of EUVD-2026-10434

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in OneUptime, a monitoring and management solution for online services, allows low-privileged project users to submit custom Playwright code that is executed on the oneuptime-probe service. This code is run inside Node's virtual machine (vm) and is given live host Playwright objects such as browser and page. This setup enables attackers to exploit the injected Playwright browser object to spawn arbitrary executables on the probe host/container, leading to a server-side Remote Code Execution (RCE) vulnerability.

Severity Evaluation: The vulnerability has a CVSS Base Score of 10.0, which is the highest possible score, indicating a critical severity. 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) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
• Privileges Required (PR): Low (L) - The attacker needs low-level privileges.
• User Interaction (UI): None (N) - No user interaction is required.
• Scope (S): Changed (C) - The vulnerability affects a different security scope.
• Confidentiality (C): High (H) - Complete loss of confidentiality.
• Integrity (I): High (H) - Complete loss of integrity.
• Availability (A): High (H) - Complete loss of availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Custom Playwright Code Submission: Attackers can submit malicious Playwright code through the OneUptime Synthetic Monitors feature.
• Direct Execution: The untrusted code is executed within Node's vm, allowing direct interaction with live host Playwright objects.

Exploitation Methods:

• Spawning Arbitrary Executables: By leveraging the injected Playwright browser object, attackers can call browser.browserType().launch(...) to spawn arbitrary executables on the probe host/container.
• Bypassing Sandbox: The attacker does not need to escape the sandbox using traditional methods like this.constructor.constructor(...). Instead, they can directly use the provided Playwright objects to execute malicious commands.

3. Affected Systems and Software Versions

Affected Systems:

• OneUptime versions prior to 10.0.20.

Software Versions:

• All versions of OneUptime before 10.0.20 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade to the Latest Version: Upgrade OneUptime to version 10.0.20 or later, where the vulnerability has been fixed.
• Disable Synthetic Monitors: Temporarily disable the Synthetic Monitors feature until the upgrade is complete.

Long-Term Mitigation:

• Code Review and Auditing: Conduct thorough code reviews and security audits to identify and mitigate similar vulnerabilities.
• Least Privilege Principle: Ensure that low-privileged users have the minimum necessary permissions.
• Regular Updates: Implement a regular update and patch management process to keep all software up-to-date.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Widespread Adoption: Given the widespread adoption of OneUptime for monitoring and managing online services, this vulnerability poses a significant risk to organizations across Europe.
• Critical Infrastructure: Organizations relying on OneUptime for critical infrastructure monitoring could face severe disruptions and potential data breaches.
• Regulatory Compliance: Non-compliance with data protection regulations such as GDPR could result in legal and financial penalties.

Regulatory and Compliance Considerations:

• GDPR Compliance: Ensure that personal data is protected and that any breaches are reported within the mandated timeframe.
• Incident Response: Develop and implement robust incident response plans to quickly address and mitigate any potential breaches.

6. Technical Details for Security Professionals

Technical Insights:

• Node's vm Module: The vulnerability leverages the Node.js vm module, which allows running JavaScript code in a sandboxed environment. However, the provided Playwright objects enable attackers to escape this sandbox.
• Playwright Objects: The Playwright browser and page objects are live host objects, providing attackers with direct access to the underlying browser and its capabilities.
• Exploit Code: The attacker can use the following code snippet to spawn an arbitrary executable:

  browser.browserType().launch({
    executablePath: '/path/to/malicious/executable'
  });
  

Detection and Monitoring:

• Log Analysis: Monitor logs for unusual activity related to the oneuptime-probe service.
• Intrusion Detection Systems (IDS): Implement IDS to detect and alert on suspicious network traffic and code execution patterns.
• Behavioral Analysis: Use behavioral analysis tools to identify anomalous behavior that may indicate an exploitation attempt.

Conclusion: The EUVD-2026-10434 vulnerability in OneUptime is a critical server-side RCE that can be exploited by low-privileged users to execute arbitrary code on the probe host/container. Organizations should prioritize upgrading to the latest version of OneUptime and implement robust security measures to mitigate the risk. The impact on the European cybersecurity landscape is significant, underscoring the need for vigilant monitoring and compliance with regulatory requirements.