Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hackerbay | Oneuptime | < 10.0.35 |
Related Weaknesses (CWE)
References
- https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141cPatch
- https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjgExploitVendor Advisory
- https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjgExploitVendor Advisory
FAQ
What is CVE-2026-33396?
CVE-2026-33396 is a vulnerability with a CVSS score of 9.9 (CRITICAL). 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 conta...
How severe is CVE-2026-33396?
CVE-2026-33396 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-33396?
Check the references section above for vendor advisories and patch information. Affected products include: Hackerbay Oneuptime.