{"id":"CVE-2026-86731","summary":"Craft CMS 5.0.0-RC1 before 5.10.12 Permission Escalation via UsersController","details":"Craft CMS versions 5.0.0-RC1 through 5.10.11 are missing an admin-target guard in UsersController::actionActivateUser (the users/activate-user action). While the action requires the administrateUsers permission, it does not call requireAdmin() when the targeted user is an administrator, unlike the mirror action actionDeactivateUser. As a result, an authenticated control panel user who is not an administrator but holds the administrateUsers permission can activate a pending or deliberately deactivated administrator account, which can lead to permission escalation when combined with resetting that account's password. The issue is fixed in Craft CMS 5.10.12.","aliases":["GHSA-jqf5-vfg6-8cx5"],"modified":"2026-09-10T03:48:32.079353182Z","published":"2026-09-08T15:14:01.558Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86731.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-862"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86731.json"},{"type":"ADVISORY","url":"https://github.com/craftcms/cms/security/advisories/GHSA-jqf5-vfg6-8cx5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86731"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/craft-cms-5.0.0-rc1-before-5.10.12-permission-escalation-via-userscontroller"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/craftcms/cms","events":[{"introduced":"04755d93f86d07cc183db47db8a0eee106892e30"},{"fixed":"4edc686e69515ad42f5608580e351c765b664f80"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"5.0.0-RC1"},{"fixed":"5.10.12"},{"fixed":"5.10.11"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86731.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}