{"id":"CVE-2026-82724","summary":"Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain","details":"Incorrect Authorization vulnerability in ash-project ash_phoenix invokes the SubdomainHook authorization callback with a nil tenant, so tenant-scoped access checks never see the tenant they are meant to enforce.\n\nAshPhoenix.LiveView.SubdomainHook.on_mount/4 attached a handle_params hook to assign the tenant and then immediately called handle_subdomain in the same on_mount. The tenant assign is only written when LiveView later runs handle_params, strictly after on_mount returns, so handle_subdomain read an unset assign and ran as apply(m, f, [socket, nil | a]). A consumer gate that halts when the user does not belong to the tenant instead evaluated nil, either crashing or taking a permissive branch, and it was never re-run once the real subdomain was assigned or on later navigations. The fix runs handle_subdomain inside the handle_params hook with the real tenant on every navigation.\n\nThis issue affects ash_phoenix: from 2.1.26 before 2.3.25.","aliases":["EEF-CVE-2026-82724","GHSA-39c8-xcwr-gqff"],"modified":"2026-09-03T03:30:55.128515054Z","published":"2026-08-31T03:07:57.455Z","database_specific":{"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82724.json","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"9a5ea4d377bc263de321d79574872a3dfc4fb541"},{"fixed":"b396e1aa5c6bdec39255f19cf938b539e6d28b71"}]}],"cna_assigner":"EEF"},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82724.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-82724"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82724.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-39c8-xcwr-gqff"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-82724"},{"type":"FIX","url":"https://github.com/ash-project/ash_phoenix/commit/b396e1aa5c6bdec39255f19cf938b539e6d28b71"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_phoenix"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_phoenix","events":[{"introduced":"02277a84d03fb43bdcbbb63dd97f9f1727509d8f"},{"fixed":"1e38e7dc8838426cc94656238d9208759c661c03"},{"fixed":"b396e1aa5c6bdec39255f19cf938b539e6d28b71"}],"database_specific":{"extracted_events":[{"introduced":"2.1.26"},{"fixed":"2.3.25"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["v2.3.24","v2.3.23","v2.3.22","v2.3.21","v2.3.20","v2.3.19","v2.3.18","v2.3.17","v2.3.10","v2.3.16","v2.3.15","v2.3.14","v2.3.13","v2.3.12","v2.3.11","v2.3.9","v2.3.8","v2.3.7","v2.3.6","v2.3.5","v2.3.4","v2.3.3","v2.3.2","v2.3.1","v2.3.0","v2.2.0","v2.1.26"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82724.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}