{"id":"CVE-2026-111909","kind":"vulnerability","aliases":["CVE-2026-111909"],"related":[],"title":"phpMyFAQ: missing authorization lets delete-user holders remove superadmin accounts","description":"phpMyFAQ before 4.1.9 contains a missing authorization vulnerability in the deleteUser() API that allows authenticated non-superadmin users with delete_user permission to delete superadmin accounts. Attackers can send a DELETE request to /admin/api/user/delete with a superadmin's userId other than 1, removing administrative access and accountability.","summary":"phpMyFAQ before 4.1.9 fails to check authorization in its deleteUser() API, so a non-superadmin user with the delete_user permission can delete superadmin accounts other than user ID 1. An attacker who holds that permission can remove administrative access and erase accountability.","severity":"high","cvss":8.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","php","phpmyfaq","self-hosted"],"not_affected_if":["no-delete-user-permission-granted","version-4.1.9-or-later"],"how_to_check":"- Check the installed phpMyFAQ version, for example with `grep -r \"VERSION\" phpmyfaq/src/phpMyFAQ/Version.php` or the admin panel footer; unknown if the sources give a different path.\n- Review which accounts hold the delete_user permission in the admin user-rights settings.","fix":"- Upgrade phpMyFAQ to `4.1.9` or later.\n- Until upgraded, remove the delete_user permission from non-superadmin accounts.","status":"open","published_at":"2026-10-17T19:16:33+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","triaged_at":"2026-10-25T03:06:37+00:00","updated_at":"2026-10-25T03:06:37+00:00","category":"package","confidence":0.8,"triage":{"at":"2026-10-25T03:06:37Z","model":"claude-haiku-5-5","output":{"fix":"- Upgrade phpMyFAQ to `4.1.9` or later.\n- Until upgraded, remove the delete_user permission from non-superadmin accounts.","reach":"internet","title":"phpMyFAQ: missing authorization lets delete-user holders remove superadmin accounts","impact":"medium","summary":"phpMyFAQ before 4.1.9 fails to check authorization in its deleteUser() API, so a non-superadmin user with the delete_user permission can delete superadmin accounts other than user ID 1. An attacker who holds that permission can remove administrative access and erase accountability.","category":"package","nicknames":[],"who_cares":["phpmyfaq","self-hosted","php"],"confidence":0.8,"needs_auth":"yes","worst_case":"Superadmin accounts get deleted, removing administrative access and audit trail","analyst_note":"","how_to_check":"- Check the installed phpMyFAQ version, for example with `grep -r \"VERSION\" phpmyfaq/src/phpMyFAQ/Version.php` or the admin panel footer; unknown if the sources give a different path.\n- Review which accounts hold the delete_user permission in the admin user-rights settings.","needs_analyst":false,"not_affected_if":["version-4.1.9-or-later","no-delete-user-permission-granted"],"who_is_affected":"Self-hosted phpMyFAQ installations running a version before 4.1.9 that have users granted the delete_user permission. Installations with no non-superadmin users holding that permission have a much smaller exposure, and managed hosts that patch on their own schedule should confirm their version.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000633,"input_tokens":3339,"output_tokens":598,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-111909':14A,17A '-2026':13A,16A '/admin/api/user/delete':102C '1':54B,110C '4.1.9':26B,70C 'access':64B,113C 'account':11A,49B,67B,94C,115C 'administr':63B,112C 'allow':81C 'api':34B,79C 'attack':56B,95C 'authent':82C 'author':3A,30B,74C 'check':29B 'contain':71C 'cve':12A,15A 'delet':6A,43B,47B,88C,92C,99C 'delete-us':5A 'deleteus':33B,78C 'eras':66B 'fail':27B 'hold':58B 'holder':8A 'host':23B 'id':53B 'let':4A 'miss':2A,73C 'non':38B,84C 'non-superadmin':37B,83C 'packag':18B 'permiss':45B,60B,90C 'php':19B 'phpmyfaq':1A,20B,24B,68C 'remov':9A,62B,111C 'request':100C 'self':22B 'self-host':21B 'send':97C 'superadmin':10A,39B,48B,85C,93C,105C 'user':7A,40B,44B,52B,86C,89C 'userid':107C 'vulner':75C","nicknames":[],"mitigations":[],"who_affected":"Self-hosted phpMyFAQ installations running a version before 4.1.9 that have users granted the delete_user permission. Installations with no non-superadmin users holding that permission have a much smaller exposure, and managed hosts that patch on their own schedule should confirm their version.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-17T19:16:33+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111909","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111909","severity":null,"published_at":"2026-10-17T19:16:33+00:00","modified_at":"2026-10-18T12:17:10+00:00","first_seen_at":"2026-10-23T21:57:14+00:00","fetched_at":"2026-10-23T22:28:55+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}