OneUptime has Synthetic Monitor RCE via exposed Playwright browser object

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-2026-30957: 1.22% estimated exploitation activity in the next 30 days; percentile 68.83 (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 Synthetic Monitors allow a low-privileged authenticated project user to execute arbitrary commands on the oneuptime-probe server/container. The root cause is that untrusted Synthetic Monitor code is executed inside Node's vm while live host-realm Playwright browser and page objects are exposed to it. A malicious user can call Playwright APIs on the injected browser object and cause the probe to spawn an attacker-controlled executable. This is a server-side remote code execution issue. It does not require a separate vm sandbox escape. Details A normal project member can create or edit monitors and monitor tests: - Monitor access control: https://github.com/OneUptime/oneuptime/blob/707bfd62e721a2845ee05b87cb5d3c611bda2276/Common/Models/DatabaseModels/Monitor.ts#L45-L70 - MonitorTest access control: https://github.com/OneUptime/oneuptime/blob/707bfd62e721a2845ee05b87cb5d3c611bda2276/Common/Models/DatabaseModels/MonitorTest.ts#L27-L52 The dashboard exposes a Playwright…

Published by the source

10 Mar 2026, 01:12 UTC

Last modified by the source

10 Mar 2026, 19:01 UTC

Source last checked

26 Oct 2026, 12:43 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-jw8q-gjvg-8w4q

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-jw8q-gjvg-8w4q

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-jw8q-gjvg-8w4q

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# Patch Next advisory brief: CVE-2026-30957

Advisory: OneUptime has Synthetic Monitor RCE via exposed Playwright browser object
IDs: CVE-2026-30957, GHSA-jw8q-gjvg-8w4q
Record: https://patchnext.com/advisories/cve-2026-30957 (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 10.0.21. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @oneuptime/common: affected < 10.0.21; fixed in 10.0.21

## 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-jw8q-gjvg-8w4q (GitHub-reviewed advisory GHSA-jw8q-gjvg-8w4q lists affected ranges: npm @oneuptime/common >=0 <10.0.21)
- Verified: https://osv.dev/vulnerability/GHSA-jw8q-gjvg-8w4q (OSV record GHSA-jw8q-gjvg-8w4q lists affected ranges: npm @oneuptime/common >=0 <10.0.21 (fixed))

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