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CVE-2026-33396

Hackerbay Oneuptime command injection

9.9 CRITICALPublic exploitEPSS 0.83%
  1. Published26 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Hackerbay Oneuptime< 10.0.35

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.35

References

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Frequently asked

Is CVE-2026-33396 being actively exploited?

CVE-2026-33396 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.83%.

How severe is CVE-2026-33396?

CVE-2026-33396 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.83% probability of exploitation.

Which products are affected by CVE-2026-33396?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-33396?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.35 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33396 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.