CVE-2026-82724 - Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain

CVE-2026-82724 - Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain

https://cvefeed.io/rssfeed/latest.atom / Mon, 08/31/2026 - 10:29
CVE ID :CVE-2026-82724
Published : Aug. 31, 2026, 4:17 a.m. | 2 hours, 14 minutes ago
Description :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. AshPhoenix.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. This issue affects ash_phoenix: from 2.1.26 before 2.3.25.
Severity: 7.6 | HIGH
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