How severe is CVE-2025-65966?

CVE-2025-65966 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2025-65966 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-65966?

CVE-2025-65966 affects Hackerbay Oneuptime. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-65966?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-65966 have an EU (EUVD) identifier?

Yes. CVE-2025-65966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199748.

When was CVE-2025-65966 published?

CVE-2025-65966 was published on 2025-11-26 and last updated on 2026-06-17.

CVE-2025-65966

CVE-2025-65966 is a high-severity vulnerability in Hackerbay Oneuptime with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-285.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 8.8
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199748
Weakness: CWE-285
Affected product: Hackerbay Oneuptime
Published: 2025-11-26
Last modified: 2026-06-17

Description

OneUptime is a solution for monitoring and managing online services. In version 9.0.5598, a low-permission user can create new accounts through a direct API request instead of being restricted to the intended interface. This issue has been patched in version 9.1.0.

Frequently asked questions

What is CVE-2025-65966?: OneUptime is a solution for monitoring and managing online services. In version 9.0.5598, a low-permission user can create new accounts through a direct API request instead of being restricted to the intended interface. This issue has been patched in version 9.1.0.
How severe is CVE-2025-65966?: CVE-2025-65966 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2025-65966 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-65966?: CVE-2025-65966 affects Hackerbay Oneuptime. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-65966?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-65966 have an EU (EUVD) identifier?: Yes. CVE-2025-65966 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199748.
When was CVE-2025-65966 published?: CVE-2025-65966 was published on 2025-11-26 and last updated on 2026-06-17.

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-m449-vh5f-574g

Affected products (1)

cpe:2.3:a:hackerbay:oneuptime:9.0.5598:*:*:*:*:*:*:*

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