CVE-2026-33396

CRITICAL 10.0

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

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78 CWE-184 CWE-693
Vendor	oneuptime
Product	oneuptime
Published	Mar 26, 2026
Last Updated	Mar 26, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

OneUptime / oneuptime

< 10.0.35

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjg github.com: https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141c46178a