CVE-2026-30957

Comprehensive Technical Analysis of CVE-2026-30957

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-30957 CVSS Score: 9.9

The vulnerability in OneUptime Synthetic Monitors prior to version 10.0.21 allows a low-privileged authenticated project user to execute arbitrary commands on the oneuptime-probe server/container. This is a critical server-side remote code execution (RCE) issue, as indicated by the high CVSS score of 9.9. The root cause is the execution of untrusted Synthetic Monitor code within Node's vm, exposing live host-realm Playwright browser and page objects. This exposure enables a malicious user to call Playwright APIs on the injected browser object, leading to the execution of attacker-controlled executables.

2. Potential Attack Vectors and Exploitation Methods

• Authenticated User Exploitation: An attacker with low-privileged access to the OneUptime project can inject malicious code into Synthetic Monitors.
• Playwright API Abuse: The attacker can exploit the exposed Playwright browser and page objects to execute arbitrary commands.
• Command Injection: By calling Playwright APIs, the attacker can spawn executables on the oneuptime-probe server/container, leading to RCE.

3. Affected Systems and Software Versions

• Affected Software: OneUptime Synthetic Monitors
• Affected Versions: All versions prior to 10.0.21
• Fixed Version: 10.0.21

4. Recommended Mitigation Strategies

• Immediate Patching: Upgrade to OneUptime version 10.0.21 or later to mitigate the vulnerability.
• Access Control: Implement strict access controls to limit the privileges of project users.
• Monitoring and Logging: Enhance monitoring and logging to detect and respond to any suspicious activities related to Synthetic Monitors.
• Code Review: Conduct thorough code reviews and security audits to ensure that untrusted code is not executed in privileged contexts.

5. Impact on Cybersecurity Landscape

This vulnerability highlights the critical importance of securing code execution environments, especially in monitoring and management solutions. The exposure of live host-realm objects to untrusted code can lead to severe security breaches, including RCE. Organizations relying on such solutions must ensure that they are promptly updated and that access controls are rigorously enforced. The high CVSS score underscores the potential for significant damage if exploited, emphasizing the need for proactive security measures.

6. Technical Details for Security Professionals

• Root Cause: The vulnerability arises from the execution of untrusted Synthetic Monitor code within Node's vm, which exposes live host-realm Playwright browser and page objects.
• Exploitation Mechanism: A malicious user can inject code into Synthetic Monitors, call Playwright APIs on the exposed browser object, and execute arbitrary commands.
• Detection: Monitor for unusual activities related to Synthetic Monitors, such as unexpected command executions or API calls.
• Response: Implement incident response plans to quickly address any detected exploitation attempts. Ensure that all instances of OneUptime are updated to the patched version.
• Prevention: Regularly update and patch all software components. Conduct security training for developers to avoid similar vulnerabilities in future code.

Conclusion

CVE-2026-30957 is a critical vulnerability that underscores the importance of securing code execution environments and enforcing strict access controls. Organizations using OneUptime should prioritize updating to version 10.0.21 and implement robust monitoring and incident response strategies to mitigate potential risks. The high CVSS score emphasizes the need for immediate action to protect against potential exploitation.

References

• OneUptime Release 10.0.21
• OneUptime Security Advisory