Vulnerability · Published Mar 10, 2026 · Assigned by GitHub_M

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

Critical 10.0

In plain English

A critical-severity missing authorization in oneuptime from OneUptime. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.5%top 54.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@oneuptime/common	10.0.21	GHSA-r5v6-2599-9g3m

Affected products (as reported)

Vendor	Product	Versions
OneUptime	oneuptime	< 10.0.21

Weakness: CWE-285, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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