Auth bypass in Hackerbay Oneuptime
CVE-2026-30956
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: -0.000
Affected products
- Hackerbay Oneuptime
- Oneuptime — versions < 10.0.21
Weakness classification (CWE)
References
- github.com/OneUptime/oneuptime/security/advisories/GHSA-r5v6-2599-9g3m (Exploit, Vendor Advisory)
- github.com/OneUptime/oneuptime/releases/tag/10.0.21 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30956?
- CVE-2026-30956 is a critical-severity vulnerability in Hackerbay Oneuptime, classified under Improper Authorization. CVSS score: 9.9/10. Published 2026-03-10.
- How severe is CVE-2026-30956?
- Critical severity. CVSS v3 base score is 9.9 out of 10.