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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00183.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Hallo Welt! GmbH BlueSpice unaffected
Version Status Constraints
5.0.0 affected < 5.1.11
5.2.0 affected < 5.2.7

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

Update to BlueSpice 5.1.11 or 5.2.7 or later.

Workaround

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.

References
Link Providers
https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07 cve-icon cve-icon
History

Fri, 23 Oct 2026 09:15:00 +0000

Type Values Removed Values Added
Description 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.
Title BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: HW

Published:

Updated: 2026-10-23T08:56:11.231Z

Reserved: 2026-02-06T14:21:19.094Z

Link: CVE-2026-25716

cve-icon Vulnrichment

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cve-icon NVD

Status : Received

Published: 2026-10-23T09:17:06.790

Modified: 2026-10-23T09:17:06.790

Link: CVE-2026-25716

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T10:30:09Z

Weaknesses