{"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","slug":"CVE-2026-25716","body":"## Overview\n\nMissing 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.\n\nThis issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7.\n\n## Affected\n\n- `Extension:BlueSpiceUserManager >= 5.0.0 < 5.1.11`\n- `Extension:BlueSpiceUserManager >= 5.2.0 < 5.2.7`\n\n## Remediation\n\nUpdate to BlueSpice 5.1.11 or 5.2.7 or later.\n\n### Workarounds\n\nDeny 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.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}