CVE-2026-82724 (GCVE-0-2026-82724)

Vulnerability from cvelistv5 – Published: 2026-08-31 03:07 – Updated: 2026-08-31 15:54
VLAI
Title
Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain
Summary
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)
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
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-31 15:53 UTC
CWE
  • CWE-863 - Incorrect Authorization
Assigner
EEF CNA under the mitre root
CNA scorecard A 96/100 over 316 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
ash-project ash_phoenix Affected: 2.1.26 , < 2.3.25 (semver)
    cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
ash-project ash_phoenix Affected: 9a5ea4d377bc263de321d79574872a3dfc4fb541 , < b396e1aa5c6bdec39255f19cf938b539e6d28b71 (git)
    cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Peter Ullrich Zach Daniel / Ash Project Jonatan Männchen / EEF
Show details on NVD website
To clipboard 

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}



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