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CVE-2026-27574

Hackerbay Oneuptime code injection

9.9 CRITICALPublic exploitEPSS 0.62%
  1. Published21 Feb 2026

Description

OneUptime is a solution for monitoring and managing online services. In versions 9.5.13 and below, custom JavaScript monitor feature uses Node.js's node:vm module (explicitly documented as not a security mechanism) to execute user-supplied code, allowing trivial sandbox escape via a well-known one-liner that grants full access to the underlying process. Because the probe runs with host networking and holds all cluster credentials (ONEUPTIME_SECRET, DATABASE_PASSWORD, REDIS_PASSWORD, CLICKHOUSE_PASSWORD) in its environment variables, and monitor creation is available to the lowest role (ProjectMember) with open registration enabled by default, any anonymous user can achieve full cluster compromise in about 30 seconds. This issue has been fixed in version 10.0.5.

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< 10.0.5

Remediation

Fixed in
Hackerbay Oneuptime≥ 10.0.5

References

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Frequently asked

Is CVE-2026-27574 being actively exploited?

CVE-2026-27574 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.62%.

How severe is CVE-2026-27574?

CVE-2026-27574 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2026-27574?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2026-27574?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 10.0.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27574 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.