What’s Vulnerable › Vulnerabilities

CVE-2026-30956: OneUptime has authorization bypass via client‑controlled is-multi-tenant-query header

• Severity: critical (CVSS 9.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-10 · updated 2026-10-07
• Weakness: CWE-285

Description

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.

Affected products

• oneuptime: before 10.0.21 — fixed in 10.0.21

How to fix

Upgrade to a fixed version: oneuptime 10.0.21. Check the vendor advisory for mitigations.

References

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

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