Vulnerability Description
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending a forged is-multi-tenant-query header together with a controlled projectid header. Because the server trusts this client-supplied header, internal permission checks in BasePermission are skipped and tenant scoping is disabled. This allows attackers to access project data belonging to other tenants, read sensitive User fields via nested relations, leak plaintext resetPasswordToken, and reset the victim’s password and fully take over the account. This results in cross‑tenant data exposure and full account takeover. This vulnerability is fixed in 10.0.21.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Hackerbay | Oneuptime | < 10.0.21 |
Related Weaknesses (CWE)
References
- https://github.com/OneUptime/oneuptime/releases/tag/10.0.21ProductRelease Notes
- https://github.com/OneUptime/oneuptime/security/advisories/GHSA-r5v6-2599-9g3mExploitVendor Advisory
FAQ
What is CVE-2026-30956?
CVE-2026-30956 is a vulnerability with a CVSS score of 9.9 (CRITICAL). OneUptime is a solution for monitoring and managing online services. Prior to 10.0.21, a low‑privileged user can bypass authorization and tenant isolation in OneUptime v10.0.20 and earlier by sending ...
How severe is CVE-2026-30956?
CVE-2026-30956 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-30956?
Check the references section above for vendor advisories and patch information. Affected products include: Hackerbay Oneuptime.