What is CVE-2026-30956?

CVE-2026-30956 is a critical-severity vulnerability in Oneuptime, classified under Improper Authorization. CVSS score: 10.0/10. Published 2026-03-10.

How severe is CVE-2026-30956?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Auth bypass in 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 t…

EPSS: 0.000 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Oneuptime — versions < 10.0.21

Weakness classification (CWE)

References

https://github.com/OneUptime/oneuptime/security/advisories/GHSA-r5v6-2599-9g3m (x_refsource_CONFIRM)
https://github.com/OneUptime/oneuptime/releases/tag/10.0.21 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-30956?: CVE-2026-30956 is a critical-severity vulnerability in Oneuptime, classified under Improper Authorization. CVSS score: 10.0/10. Published 2026-03-10.
How severe is CVE-2026-30956?: Critical severity. CVSS v3 base score is 10.0 out of 10.