What’s Vulnerable › Vulnerabilities

CVE-2026-30887: OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-10 · updated 2026-06-17
• Weakness: CWE-94

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.18, OneUptime allows project members to run custom Playwright/JavaScript code via Synthetic Monitors to test websites. However, the system executes this untrusted user code inside the insecure Node.js vm module. By leveraging a standard prototype-chain escape (this.constructor.constructor), an attacker can bypass the sandbox, gain access to the underlying Node.js process object, and execute arbitrary system commands (RCE) on the oneuptime-probe container. Furthermore, because the probe holds database/cluster credentials in its environment variables, this directly leads to a complete cluster compromise. This vulnerability is fixed in 10.0.18.

Affected products

• oneuptime: before 10.0.18 — fixed in 10.0.18

How to fix

Upgrade to a fixed version: oneuptime 10.0.18. Check the vendor advisory for mitigations.

References

• https://github.com/OneUptime/oneuptime/security/advisories/GHSA-h343-gg57-2q67
• https://github.com/OneUptime/oneuptime/security/advisories/GHSA-h343-gg57-2q67

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