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CVE-2025-66028

Hackerbay Oneuptime broken access control

8.2 HIGHPublic exploitEPSS 0.30%
  1. Published26 Nov 2025

Description

OneUptime is a solution for monitoring and managing online services. Prior to version 8.0.5567, OneUptime is vulnerable to privilege escalation via Login Response Manipulation. During the login process, the server response included a parameter called isMasterAdmin. By intercepting and modifying this parameter value from false to true, it is possible to gain access to the admin dashboard interface. However, an attacker may be unable to view or interact with the data if they still do not have sufficient permissions. This issue has been patched in version 8.0.5567.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

Hackerbay Oneuptime< 8.0.5567

Remediation

Fixed in
Hackerbay Oneuptime≥ 8.0.5567

References

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Frequently asked

Is CVE-2025-66028 being actively exploited?

CVE-2025-66028 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.30%.

How severe is CVE-2025-66028?

CVE-2025-66028 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 0.30% probability of exploitation.

Which products are affected by CVE-2025-66028?

Affected products include Hackerbay Oneuptime.

How do I fix CVE-2025-66028?

Upgrade affected software to a fixed version, for example Hackerbay Oneuptime 8.0.5567 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66028 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.