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CVE-2026-33396

CRITICAL Exploitation: PoC
10.0
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-33396
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-03-19 17:02 UTC
Published
2026-03-26 13:40 UTC
Last updated
2026-03-26 13:56 UTC
Primary CWE
CWE-78
CWE-78: Improper Neutralization of Special Elements used in …
Vendor / Product
OneUptime / oneuptime
Sources
cve.org  ·  NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
no
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
OneUptime oneuptime — < 10.0.35
Weakness (CWE)
CWESourceDescription
CWE-184 cna CWE-184: Incomplete List of Disallowed Inputs
CWE-693 cna CWE-693: Protection Mechanism Failure
CWE-78 cna CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
10.0 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References (2)
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