Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action_CVE-2026-41128

{
    "lastseen": "",
    "description": "Craft CMS is a content management system (CMS). In versions 5.6.0 through 5.9.14, the `actionSavePermissions()` endpoint allows a user with only `viewUsers` permission to remove arbitrary users from all user groups. While `_saveUserGroups()` enforces per-group authorization for additions, it performs no equivalent authorization check for removals, so submitting an empty `groups` value removes all existing group memberships. Version 5.9.15 contains a patch.",
    "published": "2026-04-21T23:32:37.911Z",
    "modified": "2026-04-21T23:32:37.911Z",
    "type": "cve",
    "title": "Craft CMS has a Missing Authorization Check on User Group Removal via save-permissions Action",
    "source": "GitHub_M",
    "references": "https://github.com/craftcms/cms/security/advisories/GHSA-jq2f-59pj-p3m3\nhttps://github.com/craftcms/cms/commit/b135384808ad43fcf8836a9dd9b877fb0087bc27",
    "id": "CVE-2026-41128",
    "bulletinFamily": "",
    "cwe": [
        "CWE-862"
    ],
    "cvelist": null,
    "sourceData": "craftcms cms >= 5.6.0, < 5.9.15",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "cms",
    "version": ">= 5.6.0, < 5.9.15",
    "vendor": "craftcms",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}