Critical 10.0Published Mar 26, 2026

CVE-2026-33396OneUptime has sandbox escape in Synthetic Monitor Playwright runtime allows project members to execute arbitrary commands on Probe

Updated under an hour ago (Oct 26, 2026, 12:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged authenticated user (ProjectMember) can achieve remote command execution on the Probe container/host by abusing Synthetic Monitor Playwright script execution. Synthetic monitor code is executed in VMRunner.runCodeInNodeVM with a live Playwright page object in context. The sandbox relies on a denylist of blocked properties/methods, but it is incomplete. Specifically, _browserType and launchServer are not blocked, so attacker code can traverse `page.context().browser()._browserType.launchServer(...)` and spawn arbitrary processes. Version 10.0.35 contains a patch.

CVSS: 10.0 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-78, CWE-184, CWE-693
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

OneUptime oneuptime oneuptime:oneuptime (from the name)	before 10.0.35	CNA record
hackerbay oneuptime hackerbay:oneuptime	before 10.0.35	NVD

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjgx-refsource-confirm, exploit, vendor-advisory
https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141c46178ax-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.