Vulnerability · Published Nov 26, 2025 · Assigned by GitHub_M

CVE-2025-66028OneUptime is Vulnerable to Privilege Escalation via Login Response Manipulation

Medium 6.9

In plain English

A medium-severity improper access control in oneuptime from OneUptime. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 74.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@oneuptime/common	8.0.5567	GHSA-675q-66gf-gqg8

Affected products (as reported)

Vendor	Product	Versions
OneUptime	oneuptime	< 8.0.5567

Weakness: CWE-284 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-675q-66gf-gqg8 x_refsource_CONFIRM
https://github.com/OneUptime/oneuptime/commit/3e72b2a9a4f50f98cf1f6cf13fa3e405715bb370 x_refsource_MISC