CVE-2026-30956

CRITICAL 10.0

OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-285 CWE-862
Vendor	oneuptime
Product	oneuptime
Published	Mar 10, 2026
Last Updated	Mar 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

OneUptime / oneuptime

< 10.0.21

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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