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CVE-2026-30957

Hackerbay Oneuptime remote code execution

9.9 CRITICALPublic exploitEPSS 1.20%
  1. Published10 Mar 2026

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, OneUptime Synthetic Monitors allow a low-privileged authenticated project user to execute arbitrary commands on the oneuptime-probe server/container. The root cause is that untrusted Synthetic Monitor code is executed inside Node's vm while live host-realm Playwright browser and page objects are exposed to it. A malicious user can call Playwright APIs on the injected browser object and cause the probe to spawn an attacker-controlled executable. This is a server-side remote code execution issue. It does not require a separate vm sandbox escape. This vulnerability is fixed in 10.0.21.

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< 10.0.21

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.21

References

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Frequently asked

Is CVE-2026-30957 being actively exploited?

CVE-2026-30957 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.20%.

How severe is CVE-2026-30957?

CVE-2026-30957 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 1.20% probability of exploitation.

Which products are affected by CVE-2026-30957?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-30957?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30957 against the real software inventory on every managed device, every day. 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.