High severity · published Nov 26, 2025
CVE-2025-65966
OneUptime Unauthorized User Creation via API
8.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ON
oneuptime · OneUptime
= 9.0.5598 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-65966
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-65966
Exploit
https://github.com/OneUptime/oneuptime/security/advisories/GHSA-m449-vh5f-574g
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