{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-82724",
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "state": "PUBLISHED",
        "assignerShortName": "EEF",
        "dateReserved": "2026-08-31T00:59:08.960Z",
        "datePublished": "2026-08-31T03:07:57.455Z",
        "dateUpdated": "2026-08-31T03:07:57.455Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://repo.hex.pm",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.AshPhoenix.LiveView.SubdomainHook'"
                    ],
                    "packageName": "ash_phoenix",
                    "packageURL": "pkg:hex/ash_phoenix",
                    "product": "ash_phoenix",
                    "programFiles": [
                        "lib/ash_phoenix/live_view/subdomain_hook.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.AshPhoenix.LiveView.SubdomainHook':on_mount/4"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash_phoenix",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "2.3.25",
                            "status": "affected",
                            "version": "2.1.26",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.AshPhoenix.LiveView.SubdomainHook'"
                    ],
                    "packageName": "ash-project/ash_phoenix",
                    "packageURL": "pkg:github/ash-project/ash_phoenix",
                    "product": "ash_phoenix",
                    "programFiles": [
                        "lib/ash_phoenix/live_view/subdomain_hook.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.AshPhoenix.LiveView.SubdomainHook':on_mount/4"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash_phoenix",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "b396e1aa5c6bdec39255f19cf938b539e6d28b71",
                            "status": "affected",
                            "version": "9a5ea4d377bc263de321d79574872a3dfc4fb541",
                            "versionType": "git"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>The application uses <code>AshPhoenix.LiveView.SubdomainHook</code> with a <code>handle_subdomain</code> callback as a tenant-scoped authorization gate.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "The application uses `AshPhoenix.LiveView.SubdomainHook` with a `handle_subdomain` callback as a tenant-scoped authorization gate."
                        }
                    ],
                    "value": "The application uses AshPhoenix.LiveView.SubdomainHook with a handle_subdomain callback as a tenant-scoped authorization gate."
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "cpeMatch": [
                                {
                                    "criteria": "cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "2.3.25",
                                    "versionStartIncluding": "2.1.26",
                                    "vulnerable": true
                                }
                            ],
                            "negate": false,
                            "operator": "OR"
                        }
                    ],
                    "operator": "AND"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "Peter Ullrich"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Peter Ullrich"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Zach Daniel / Ash Project"
                },
                {
                    "lang": "en",
                    "type": "coordinator",
                    "value": "Jonatan Männchen / EEF"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>Incorrect Authorization vulnerability in ash-project ash_phoenix invokes the <code>SubdomainHook</code> authorization callback with a <code>nil</code> tenant, so tenant-scoped access checks never see the tenant they are meant to enforce.</p>\n<p><code>AshPhoenix.LiveView.SubdomainHook.on_mount/4</code> attached a <code>handle_params</code> hook to assign the tenant and then immediately called <code>handle_subdomain</code> in the same <code>on_mount</code>. The tenant assign is only written when LiveView later runs <code>handle_params</code>, strictly after <code>on_mount</code> returns, so <code>handle_subdomain</code> read an unset assign and ran as <code>apply(m, f, [socket, nil | a])</code>. A consumer gate that halts when the user does not belong to the tenant instead evaluated <code>nil</code>, 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 <code>handle_subdomain</code> inside the <code>handle_params</code> hook with the real tenant on every navigation.</p>\n<p>This issue affects ash_phoenix: from 2.1.26 before 2.3.25.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "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.\n\n`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.\n\nThis issue affects ash_phoenix: from 2.1.26 before 2.3.25."
                        }
                    ],
                    "value": "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.\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."
                }
            ],
            "impacts": [
                {
                    "capecId": "CAPEC-1",
                    "descriptions": [
                        {
                            "lang": "en",
                            "value": "CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "attackVector": "NETWORK",
                        "baseScore": 7.6,
                        "baseSeverity": "HIGH",
                        "privilegesRequired": "LOW",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "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",
                        "version": "4.0",
                        "vulnAvailabilityImpact": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnerabilityResponseEffort": "NOT_DEFINED"
                    },
                    "format": "CVSS",
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ]
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-863",
                            "description": "CWE-863 Incorrect Authorization",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
                "shortName": "EEF",
                "dateUpdated": "2026-08-31T03:07:57.455Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory",
                        "related"
                    ],
                    "url": "https://github.com/ash-project/ash_phoenix/security/advisories/GHSA-39c8-xcwr-gqff"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://cna.erlef.org/cves/CVE-2026-82724.html"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://osv.dev/vulnerability/EEF-CVE-2026-82724"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/ash-project/ash_phoenix/commit/b396e1aa5c6bdec39255f19cf938b539e6d28b71"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "title": "Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain"
        }
    }
}