CVE-2026-33396: OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.35, a low-privileged…
CVE-2026-33396 · Severity: critical · CVSS 9.9 · Published 2026-03-26
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-33396 being exploited in the wild.
How severe is CVE-2026-33396?
Critical severity, with a CVSS score of 9.9, published 26 March 2026.
Which products and versions are affected?
Hackerbay Oneuptime. The advisory does not name versions.
Is there a fix for CVE-2026-33396?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33396?
Check whether you run Hackerbay Oneuptime. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.