{"affected":[{"package":{"ecosystem":"Hex","name":"ash_phoenix","purl":"pkg:hex/ash_phoenix"},"ranges":[{"events":[{"introduced":"2.1.26"},{"fixed":"2.3.25"}],"type":"SEMVER"}],"versions":["2.1.26","2.2.0","2.3.0","2.3.1","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","2.3.7","2.3.8","2.3.9","2.3.10","2.3.11","2.3.12","2.3.13","2.3.14","2.3.15","2.3.16","2.3.17","2.3.18","2.3.19","2.3.20","2.3.21","2.3.22","2.3.23","2.3.24"]},{"ranges":[{"events":[{"introduced":"9a5ea4d377bc263de321d79574872a3dfc4fb541"},{"fixed":"b396e1aa5c6bdec39255f19cf938b539e6d28b71"}],"repo":"https://github.com/ash-project/ash_phoenix","type":"GIT"}]}],"aliases":["GHSA-39c8-xcwr-gqff","CVE-2026-82724"],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}],"database_specific":{"capec_ids":["CAPEC-1"],"cpe_ids":["cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-863"]},"details":"## Summary\n\nIncorrect 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.\n\n## Configuration\n\nThe application uses AshPhoenix.LiveView.SubdomainHook with a handle\\_subdomain callback as a tenant-scoped authorization gate.","id":"EEF-CVE-2026-82724","modified":"2026-08-31T03:07:57.911368Z","published":"2026-08-31T03:07:57.455Z","references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-39c8-xcwr-gqff"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-82724.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_phoenix/commit/b396e1aa5c6bdec39255f19cf938b539e6d28b71"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_phoenix"}],"related":[],"schema_version":"1.7.3","severity":[{"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","type":"CVSS_V4"}],"summary":"Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain","upstream":[]}