{"id":"CVE-2026-25716","state":"PUBLISHED","title":"BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users","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.\n\nThis issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7.","publishedAt":"2026-10-23T08:53:47.208Z","updatedAt":"2026-10-29T01:52:06.615Z","severity":{"score":7.1,"label":"High","version":"4.0","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","source":"HW"},"assigner":"HW","products":["Hallo Welt! GmbH BlueSpice"],"affected":[{"vendor":"Hallo Welt! GmbH","product":"BlueSpice","packageName":"Extension:BlueSpiceUserManager","defaultStatus":"unaffected","versions":[{"version":"5.0.0","status":"affected","lessThan":"5.1.11","versionType":"semver"},{"version":"5.2.0","status":"affected","lessThan":"5.2.7","versionType":"semver"}],"collectionURL":"https://github.com/wikimedia/mediawiki-extensions-BlueSpiceUserManager","repo":"https://gerrit.wikimedia.org/r/mediawiki/extensions/BlueSpiceUserManager","programFiles":["src/UserManager.php","src/Rest/BlockUsersHandler.php","src/Rest/UnblockUsersHandler.php"],"programRoutines":[{"name":"BlueSpice\\UserManager\\UserManager::blockUser"},{"name":"BlueSpice\\UserManager\\UserManager::unblockUser"}]}],"references":["https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/25xxx/CVE-2026-25716.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-25716","state":"PUBLISHED","datePublished":"2026-10-23T08:53:47.208Z","dateUpdated":"2026-10-29T01:52:06.615Z","assignerShortName":"HW","assignerOrgId":"ff95705b-1a40-4639-8017-a58fa868baee","dateReserved":"2026-02-06T14:21:19.094Z"},"containers":{"cna":{"title":"BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users","descriptions":[{"lang":"en","value":"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.\n\nThis issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7."}],"affected":[{"vendor":"Hallo Welt! GmbH","product":"BlueSpice","packageName":"Extension:BlueSpiceUserManager","defaultStatus":"unaffected","versions":[{"version":"5.0.0","status":"affected","lessThan":"5.1.11","versionType":"semver"},{"version":"5.2.0","status":"affected","lessThan":"5.2.7","versionType":"semver"}],"collectionURL":"https://github.com/wikimedia/mediawiki-extensions-BlueSpiceUserManager","repo":"https://gerrit.wikimedia.org/r/mediawiki/extensions/BlueSpiceUserManager","programFiles":["src/UserManager.php","src/Rest/BlockUsersHandler.php","src/Rest/UnblockUsersHandler.php"],"programRoutines":[{"name":"BlueSpice\\UserManager\\UserManager::blockUser"},{"name":"BlueSpice\\UserManager\\UserManager::unblockUser"}]}],"references":[{"url":"https://en.wiki.bluespice.com/wiki/Security:Security_Advisories/BSSA-2026-07","tags":["vendor-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.1,"vectorString":"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"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.1,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862 Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"HW","orgId":"ff95705b-1a40-4639-8017-a58fa868baee","dateUpdated":"2026-10-23T08:56:11.231Z"},"datePublic":"2026-10-02T00:00:00.000Z","impacts":[{"capecId":"CAPEC-122","descriptions":[{"lang":"en","value":"CAPEC-122 Privilege Abuse"}]}],"workarounds":[{"lang":"en","value":"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.","supportingMedia":[{"type":"text/html","base64":false,"value":"Deny access to the REST paths <code>/rest.php/bs-usermanager/v1/block/create</code> and <code>/rest.php/bs-usermanager/v1/block/delete</code> on the web server or reverse proxy. Note that this also disables enabling/disabling users from Special:UserManager."}]}],"solutions":[{"lang":"en","value":"Update to BlueSpice 5.1.11 or 5.2.7 or later.","supportingMedia":[{"type":"text/html","base64":false,"value":"Update to BlueSpice 5.1.11 or 5.2.7 or later."}]}],"credits":[{"lang":"en","value":"kta1kri","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Hallo Welt! CERT"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-25716","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-29T01:40:46.901774Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T01:52:06.615Z"}}]}}}