{"id":"CVE-2026-43621","summary":"Simple Machines Forum \u003c 2.1.7 Authorization Confusion via Profile::load()","details":"Simple Machines Forum (SMF) through 2.1.7, fixed in commit 6f0dc61, contains an authorization state-confusion vulnerability in the profile loader that allows authenticated low-privileged users to gain administrator access by supplying multiple values for the user parameter. Attackers can exploit the mismatch between Profile::$member and User::$me-\u003eis_owner during sequential profile loading to be treated as the owner of an administrator profile, enabling unauthorized password changes and full account takeover.","modified":"2026-08-30T03:30:29.277696068Z","published":"2026-08-26T21:27:52.842Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43621.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43621.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43621"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/simple-machines-forum-authorization-confusion-via-profile-load"},{"type":"FIX","url":"https://github.com/SimpleMachines/SMF/commit/6f0dc61958aa86a4b436a222f6176812ed5bbb95"},{"type":"PACKAGE","url":"https://github.com/SimpleMachines/SMF"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/simplemachines/smf","events":[{"introduced":"0"},{"fixed":"d49255b955cbeeb3a702d77009c85aae517ed1e4"},{"fixed":"6f0dc61958aa86a4b436a222f6176812ed5bbb95"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.1.7"}]}}],"versions":["v3.0-alpha.4","v2.1.6","v2.1.5","v3.0-alpha.3","v3.0-alpha.2","v3.0-alpha.1","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.1-rc.4","v2.1-rc.3","v2.1-rc.2","v2.1-rc.1","v2.1-beta.3","v2.1-beta.2","v2.1-beta.1","2.1beta1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43621.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:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}