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CVE-2026-33396

CRITICAL CVSS 3.1: 9.9 EPSS 0.84%
Updated Mar 26, 2026
Hackerbay
Parameter Value
CVSS 9.9 (CRITICAL)
Affected Versions before 10.0.35
Fixed In 10.0.35
Type CWE-693, CWE-184, CWE-78 (OS Command Injection)
Vendor Hackerbay
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Hackerbay Oneuptime
cpe:2.3:a:hackerbay:oneuptime:*:*:*:*:*:*:*:*
10.0.35