OneUpTime's Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-30887: 0.41% estimated exploitation activity in the next 30 days; percentile 35.44 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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. Details The root cause of the vulnerability exists in Common/Server/Utils/VM/VMRunner.ts where user-supplied JavaScript is executed using vm.runInContext(): The Node.js documentation explicitly warns that the vm module is not a security boundary and should never be used to run untrusted code. When a user creates a Synthetic Monitor, the code inputted into the Playwright script…

Published by the source

7 Mar 2026, 02:30 UTC

Last modified by the source

10 Mar 2026, 18:48 UTC

Source last checked

26 Oct 2026, 12:43 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-h343-gg57-2q67

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-h343-gg57-2q67

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-h343-gg57-2q67

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# Patch Next advisory brief: CVE-2026-30887

Advisory: OneUpTime's Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE
IDs: CVE-2026-30887, GHSA-h343-gg57-2q67
Record: https://patchnext.com/advisories/cve-2026-30887 (revision 3, source checked 26 Oct 2026, 12:43 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @oneuptime/common 10.0.18. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @oneuptime/common: affected < 10.0.18; fixed in 10.0.18

## Suggested inspection (read-only)
- `npm ls @oneuptime/common --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @oneuptime/common.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-h343-gg57-2q67 (GitHub-reviewed advisory GHSA-h343-gg57-2q67 lists affected ranges: npm @oneuptime/common >=0 <10.0.18)
- Verified: https://osv.dev/vulnerability/GHSA-h343-gg57-2q67 (OSV record GHSA-h343-gg57-2q67 lists affected ranges: npm @oneuptime/common >=0 <10.0.18 (fixed))

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