CVE-2026-33396 - OneUptime has sandbox escape in Synthetic Monitor Playwright runtime allows project members to execute arbitrary commands on Probe

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CRITICAL

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

Published Mar 26, 2026

10.0

CRITICAL

CVSS 3.1

EPSS 1.15%

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.

Affected products

Vendor OneUptime Product Oneuptime Default
n/a
- Version
  < 10.0.35
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

OneUptime

Oneuptime

n/a

Version	Status	Constraints
< 10.0.35	affected	-

Remediation

No remediation recorded yet.

Weaknesses (3)

CWE-184

CWE-693

CWE-78

OS Command Injection

References (3)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-16189
Advisory
https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141c46178a
x_refsource_MISCPatch
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjg
exploitx_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-16189		Advisory
https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141c46178a		x_refsource_MISCPatch
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjg		exploitx_refsource_CONFIRMVendor Advisory