High severity · published Oct 23, 2026
CVE-2026-25716
BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users
New
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BL
BlueSpice · Hallo Welt! GmbH
5.0.0 before 5.1.11; 5.2.0 before 5.2.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25716
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-25716
en.wiki.bluespice.com
https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07
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