{"id":"CVE-2026-82724","aliases":["EEF-CVE-2026-82724","GHSA-39c8-xcwr-gqff"],"url":"https://o3.security/vulnerability/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.","published":"2026-08-31T03:07:57.455Z","modified":"2026-09-01T03:46:37.456796186Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/ash-project/ash_phoenix/commit/b396e1aa5c6bdec39255f19cf938b539e6d28b71","label":"ash-project/ash_phoenix@b396e1a"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-01T03:46:37.456796186Z"}}