{"id":"CVE-2026-39903","summary":"Simple Machines Forum Authorization Bypass via AttachmentApprove.php","details":"Simple Machines Forum 2.1 prior to commit 7d048f8 and 3.0 prior to commit a7875e8 contains an authorization bypass vulnerability in Sources/Actions/AttachmentApprove.php where a single-character operator error causes the permission check to always pass regardless of user permissions. An authenticated low-privileged user can approve, reject, or delete any pending attachments on any board without holding the required approve_posts permission, bypass moderation queues for their own uploads, and enumerate and delete other users' pending attachments.","modified":"2026-07-16T03:48:29.997318740Z","published":"2026-07-10T16:03:20.983Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39903.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"3.0.0"},{"last_affected":"3.0.0"}]}],"cna_assigner":"VulnCheck","cwe_ids":["CWE-863"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39903.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39903"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/simple-machines-forum-authorization-bypass-via-attachmentapprove-php"},{"type":"REPORT","url":"https://github.com/SimpleMachines/SMF/pull/9181"},{"type":"REPORT","url":"https://github.com/SimpleMachines/SMF/pull/9182"},{"type":"FIX","url":"https://github.com/SimpleMachines/SMF/commit/7d048f8d66aab9af51cd6ee110fbad103cf673e8"},{"type":"FIX","url":"https://github.com/SimpleMachines/SMF/commit/a7875e876a647572dd4c45da881b875092caac3d"},{"type":"PACKAGE","url":"https://github.com/SimpleMachines/SMF"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/simplemachines/smf","events":[{"introduced":"453cbdbaec8e022bb1a582a145edcc6fc0edac0e"},{"fixed":"7d048f8d66aab9af51cd6ee110fbad103cf673e8"},{"fixed":"a7875e876a647572dd4c45da881b875092caac3d"}],"database_specific":{"extracted_events":[{"introduced":"2.1.0"},{"last_affected":"2.1.7"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v2.1.7","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"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39903.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N"}]}