---
id: CVE-2026-25716
title: >-
  BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and
  unblocking users
summary: >-
  Missing Authorization vulnerability in Hallo Welt! GmbH BlueSpice
  (Extension:BlueSpiceUserManager) allows any authenticated user without special
  privileges to block or unblock arbitrary user accounts, including
  administrators. The REST e…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'
cvssSource: cna
cwe:
  - CWE-862
vendor: Hallo Welt! GmbH
product: 'Extension:BlueSpiceUserManager'
affected:
  - 'Extension:BlueSpiceUserManager >= 5.0.0 < 5.1.11'
  - 'Extension:BlueSpiceUserManager >= 5.2.0 < 5.2.7'
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T08:56:11.231Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-25716'
references:
  - url: >-
      https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07
tags:
  - cve.org
ingestedAt: '2026-10-23T09:20:44.057Z'
---

## Overview

Missing Authorization vulnerability in Hallo Welt! GmbH BlueSpice (Extension:BlueSpiceUserManager) allows any authenticated user without special privileges to block or unblock arbitrary user accounts, including administrators. The REST endpoints /bs-usermanager/v1/block/create and /bs-usermanager/v1/block/delete call UserManager::blockUser() and UserManager::unblockUser(), which do not verify the permissions of the acting user. This allows locking out all administrators (denial of service) and lifting blocks imposed by administrators.

This issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7.

## Affected

- `Extension:BlueSpiceUserManager >= 5.0.0 < 5.1.11`
- `Extension:BlueSpiceUserManager >= 5.2.0 < 5.2.7`

## Remediation

Update to BlueSpice 5.1.11 or 5.2.7 or later.

### Workarounds

Deny access to the REST paths /rest.php/bs-usermanager/v1/block/create and /rest.php/bs-usermanager/v1/block/delete on the web server or reverse proxy. Note that this also disables enabling/disabling users from Special:UserManager.