CVE-2025-66028 OneUptime is Vulnerable to Privilege Escalation via Login Response Manipulation
Attackers can escalate privileges to admin by manipulating the isMasterAdmin parameter in the login response, bypassing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-66028?
CVE-2025-66028 is a medium-severity vulnerability in oneuptime, published on 26 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-284
Which versions are affected by CVE-2025-66028?
2 open source packages ship an affected version, including @oneuptime/common. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@oneuptime/common npm | All versions | 8.0.5567 |
@oneuptime/common npm | All versions | 8.0.5567 |
Products include Hackerbay Oneuptime.
How do I fix CVE-2025-66028?
Upgrade @oneuptime/common to 8.0.5567 or later.
Is CVE-2025-66028 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66028 exists.
Other vulnerabilities in oneuptime
- CVE-2026-33396 Code injection in oneuptime
- CVE-2026-32306 OneUptime ClickHouse SQL Injection via Aggregate Query Parameters
- CVE-2026-30956 OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header
- CVE-2026-30957 OneUptime Synthetic Monitor RCE via exposed Playwright browser object
- CVE-2026-30887 OneUptime Affected by Unsandboxed Code Execution in Probe Allows Any Project Member to Achieve RCE
Sources
Also known as GHSA-675q-66gf-gqg8.