CVE-2026-30956
CRITICAL
GHSA-r5v6-2599-9g3m
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Description
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.
Analysis
OneUptime prior to 10.0.21 has a third authorization bypass enabling low-privileged users to access admin functions.
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Remediation
Within 24 hours: Inventory all OneUptime instances and their versions, isolate affected systems from production networks if possible, and contact OneUptime vendor for emergency patch timeline. Within 7 days: Implement network-level access controls to restrict OneUptime API endpoints, deploy WAF rules to block forged is-multi-tenant-query headers, and enforce strict input validation on projectid parameters. …
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External POC / Exploit Code
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