---
cve: "CVE-2026-82724"
severity: "LOW"
cvss: 3.1
epss: "5.8%"
vendor: "Generic Security"
kev: false
exploited: false
published: "2026-08-31 04:17:28"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T01:00:19+02:00"
---

# CVE-2026-82724

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- 1e38e7dc8838426cc94656238d9208759c661c03 (Commit)
- b396e1aa5c6bdec39255f19cf938b539e6d28b71 (Commit)

## Referenzen

- <https://cna.erlef.org/cves/CVE-2026-82724.html>
- <https://github.com/ash-project/ash_phoenix/commit/b396e1aa5c6bdec39255f19cf938b539e6d28b71>
- <https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-39c8-xcwr-gqff>
- <https://osv.dev/vulnerability/EEF-CVE-2026-82724>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-82724) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_