CVE-2026-82724 (GCVE-0-2026-82724)
Vulnerability from cvelistv5 – Published: 2026-08-31 03:07 – Updated: 2026-08-31 15:54
VLAI
EPSS
VEX
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
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
References
4 references
| URL | Tags |
|---|---|
| https://github.com/ash-project/ash_phoenix/securi… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-82724.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-82724 | related |
| https://github.com/ash-project/ash_phoenix/commit… | patch |
Impacted products
2 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:*:*:*:*:*:*:*:* |
||
| ash-project | ash_phoenix |
Affected:
9a5ea4d377bc263de321d79574872a3dfc4fb541 , < b396e1aa5c6bdec39255f19cf938b539e6d28b71
(git)
cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:* |
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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