CVE-2026-33396

Description

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 Metrics

• v3.1•CRITICAL•Score: 10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Techniques & Countermeasures

• CWE-78•Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

  The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

• CWE-184•Incomplete List of Disallowed Inputs

  The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete.

• CWE-693•Protection Mechanism Failure

  The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Affected Systems

• oneuptime•oneuptime

  < 10.0.35

References (2)

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