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CVE-2026-30887

Hackerbay Oneuptime code injection

9.9 CRITICALPublic exploitEPSS 0.59%
  1. Published10 Mar 2026

Description

OneUptime is a solution for monitoring and managing online services. Prior to 10.0.18, OneUptime allows project members to run custom Playwright/JavaScript code via Synthetic Monitors to test websites. However, the system executes this untrusted user code inside the insecure Node.js vm module. By leveraging a standard prototype-chain escape (this.constructor.constructor), an attacker can bypass the sandbox, gain access to the underlying Node.js process object, and execute arbitrary system commands (RCE) on the oneuptime-probe container. Furthermore, because the probe holds database/cluster credentials in its environment variables, this directly leads to a complete cluster compromise. This vulnerability is fixed in 10.0.18.

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< 10.0.18

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.18

References

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Frequently asked

Is CVE-2026-30887 being actively exploited?

CVE-2026-30887 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-30887?

CVE-2026-30887 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-30887?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-30887?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-30887 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.