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CVE-2026-30921

Hackerbay Oneuptime vulnerability

9.9 CRITICALPublic exploitEPSS 0.54%
  1. Published10 Mar 2026

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.20, OneUptime Synthetic Monitors allow low-privileged project users to submit custom Playwright code that is executed on the oneuptime-probe service. In the current implementation, this untrusted code is run inside Node's vm and is given live host Playwright objects such as browser and page. This creates a distinct server-side RCE primitive: the attacker does not need the classic this.constructor.constructor(...) sandbox escape. Instead, the attacker can directly use the injected Playwright browser object to reach browser.browserType().launch(...) and spawn an arbitrary executable on the probe host/container. This vulnerability is fixed in 10.0.20.

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< 10.0.20

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.20

References

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Frequently asked

Is CVE-2026-30921 being actively exploited?

CVE-2026-30921 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-30921?

CVE-2026-30921 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-30921?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-30921?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.20 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30921 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.