CVE-2026-33396: OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged authenticated user (ProjectMember) can achieve…

PriorityP268critical9.9CVSS 3.1

AVNACLPRLUINSCCHIHAH

EPSS

0.83%

53.0th percentile

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
hackerbay	oneuptime	< 10.0.35	10.0.35
oneuptime	oneuptime	< 10.0.35	10.0.35

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