# CVE-2026-33396

## Summary

- **CVE ID:** CVE-2026-33396
- **Severity:** CRITICAL
- **CVSS Score:** 10 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** CWE-78, CWE-184, CWE-693
- **Published:** Mar 26, 2026
- **Last Modified:** Mar 26, 2026

## 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

- OneUptime — oneuptime (< 10.0.35)

## References

- [CNA](https://github.com/OneUptime/oneuptime/security/advisories/GHSA-cqpg-phpp-9jjg)
- [CNA](https://github.com/OneUptime/oneuptime/commit/e8e4ee3ff0740eb131045ab3d67453141c46178a)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.83%
- **EPSS Percentile:** 55.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._