CVE-2026-30956

moderate-risk

Published 2026-03-10

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.

Do I need to act?

0.05% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Fix available

Upgrade to: fed52fecd9cc384bc8cbc03d9765e5b610201eca

CVSS 9.9/10 Critical

NETWORK / LOW complexity

Affected Products (1)

Oneuptime

Affected Vendors

Hackerbay

References (2)

Product https://github.com/OneUptime/oneuptime/releases/tag/10.0.21

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

/ 100

moderate-risk

Severity 33/34 · Critical

Exploitability 0/34 · Minimal

Exposure 5/34 · Minimal