---
id: CVE-2026-30956
title: OneUptime is a solution for monitoring and managing online services
summary: >-
  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…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-285
  - CWE-862
vendor: hackerbay
product: oneuptime
affected:
  - oneuptime < 10.0.21
patched:
  - oneuptime 10.0.21
published: '2026-03-10'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T08:10:00.200'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-30956'
references:
  - url: 'https://github.com/OneUptime/oneuptime/releases/tag/10.0.21'
    label: security-advisories@github.com
  - url: >-
      https://github.com/OneUptime/oneuptime/security/advisories/GHSA-r5v6-2599-9g3m
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00503
epssPercentile: 0.41084
ingestedAt: '2026-10-07T08:20:03.898Z'
---

## Overview

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

- `oneuptime < 10.0.21`

## Remediation

Upgrade past the affected range:

- `oneuptime 10.0.21`