CVE-2026-30956

CRITICAL EPSS 38.7%

Published Mar 10, 20263mo ago · Modified Jun 17, 20261w ago

9.9 CVSS 3.1

Critical

Published Mar 10, 2026 3mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

9.9

Exploitability

3.1

Impact

6.0

Vector string

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

Threat Intelligence

EPSS Exploit Probability

38.7% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 2

CWE-285

CWE-862 Missing Authorization Authorization

Affected Products 1

Vendor	Product	Version	Range
hackerbay	oneuptime	*	<10.0.21

References 2

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

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

ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.