{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-25716",
        "assignerOrgId": "ff95705b-1a40-4639-8017-a58fa868baee",
        "state": "PUBLISHED",
        "assignerShortName": "HW",
        "dateReserved": "2026-02-06T14:21:19.094Z",
        "datePublished": "2026-10-23T08:53:47.208Z",
        "dateUpdated": "2026-10-23T08:56:11.231Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "ff95705b-1a40-4639-8017-a58fa868baee",
                "shortName": "HW",
                "dateUpdated": "2026-10-23T08:56:11.231Z"
            },
            "title": "BlueSpiceUserManager: Missing authorization in REST endpoints for blocking and unblocking users",
            "datePublic": "2026-10-02T00:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-862",
                            "description": "CWE-862 Missing Authorization",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-122",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-122 Privilege Abuse"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Hallo Welt! GmbH",
                    "product": "BlueSpice",
                    "collectionURL": "https://github.com/wikimedia/mediawiki-extensions-BlueSpiceUserManager",
                    "packageName": "Extension: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"
                        }
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "5.0.0",
                            "lessThan": "5.1.11",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "5.2.0",
                            "lessThan": "5.2.7",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "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.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "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 <code>/bs-usermanager/v1/block/create</code> and <code>/bs-usermanager/v1/block/delete</code> call <code>UserManager::blockUser()</code> and <code>UserManager::unblockUser()</code>, 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.<p>This issue affects BlueSpice: from 5.0.0 before 5.1.11, from 5.2.0 before 5.2.7.</p>"
                        }
                    ]
                }
            ],
            "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"
                    }
                }
            ],
            "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"
            }
        }
    }
}