{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-78699",
        "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "state": "PUBLISHED",
        "assignerShortName": "EEF",
        "dateReserved": "2026-08-30T06:00:01.261Z",
        "datePublished": "2026-08-30T15:13:23.875Z",
        "dateUpdated": "2026-08-30T15:13:23.875Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "collectionURL": "https://repo.hex.pm",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.AshPostgres.MultiTenancy'"
                    ],
                    "packageName": "ash_postgres",
                    "packageURL": "pkg:hex/ash_postgres",
                    "product": "ash_postgres",
                    "programFiles": [
                        "lib/multitenancy.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.AshPostgres.MultiTenancy':rename_tenant/3"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash_postgres",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "2.13.0",
                            "status": "affected",
                            "version": "0.25.0",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "collectionURL": "https://github.com",
                    "cpes": [
                        "cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*"
                    ],
                    "defaultStatus": "unaffected",
                    "modules": [
                        "'Elixir.AshPostgres.MultiTenancy'"
                    ],
                    "packageName": "ash-project/ash_postgres",
                    "packageURL": "pkg:github/ash-project/ash_postgres",
                    "product": "ash_postgres",
                    "programFiles": [
                        "lib/multitenancy.ex"
                    ],
                    "programRoutines": [
                        {
                            "name": "'Elixir.AshPostgres.MultiTenancy':rename_tenant/3"
                        }
                    ],
                    "repo": "https://github.com/ash-project/ash_postgres",
                    "vendor": "ash-project",
                    "versions": [
                        {
                            "lessThan": "8544ab15fe45784553c2d2da8ee1a388eee0174b",
                            "status": "affected",
                            "version": "03510dae24020e302558ef947be7ea874a9ce756",
                            "versionType": "git"
                        }
                    ]
                }
            ],
            "configurations": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "<p>An application must run ash_postgres schema-based multitenancy with a user-driven tenant rename (for example a <code>manage_tenant</code> update on an editable org slug or subdomain), letting a user choose a new tenant name that collides with an existing tenant's schema.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "An application must run ash_postgres schema-based multitenancy with a user-driven tenant rename (for example a `manage_tenant` update on an editable org slug or subdomain), letting a user choose a new tenant name that collides with an existing tenant's schema."
                        }
                    ],
                    "value": "An application must run ash_postgres schema-based multitenancy with a user-driven tenant rename (for example a manage_tenant update on an editable org slug or subdomain), letting a user choose a new tenant name that collides with an existing tenant's schema."
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "cpeMatch": [
                                {
                                    "criteria": "cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:*",
                                    "versionEndExcluding": "2.13.0",
                                    "versionStartIncluding": "0.25.0",
                                    "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>Unchecked Return Value vulnerability in ash-project ash_postgres allows a user who can drive a tenant rename to a name that collides with an existing tenant's schema to have their tenant record repointed at that other tenant's live schema, gaining access to its data.</p>\n<p><code>AshPostgres.MultiTenancy.rename_tenant/3</code> issues the <code>ALTER SCHEMA ... RENAME TO ...</code> with the non-raising <code>Ecto.Adapters.SQL.query/2</code>, discards its <code>{:ok, _} | {:error, _}</code> result, and unconditionally returns <code>:ok</code>. PostgreSQL rejects the rename when the target schema already exists (and on insufficient privilege or lock timeout), but that failure never reaches the caller. The calling <code>manage_tenant</code> update action therefore sees success and commits the tenant row with the new name, which is the schema of a different existing tenant, so subsequent reads and writes for that tenant run against the other tenant's data.</p>\n<p>This issue affects ash_postgres: from 0.25.0 before 2.13.0.</p>"
                        },
                        {
                            "base64": false,
                            "type": "text/markdown",
                            "value": "Unchecked Return Value vulnerability in ash-project ash_postgres allows a user who can drive a tenant rename to a name that collides with an existing tenant's schema to have their tenant record repointed at that other tenant's live schema, gaining access to its data.\n\n`AshPostgres.MultiTenancy.rename_tenant/3` issues the `ALTER SCHEMA ... RENAME TO ...` with the non-raising `Ecto.Adapters.SQL.query/2`, discards its `{:ok, _} | {:error, _}` result, and unconditionally returns `:ok`. PostgreSQL rejects the rename when the target schema already exists (and on insufficient privilege or lock timeout), but that failure never reaches the caller. The calling `manage_tenant` update action therefore sees success and commits the tenant row with the new name, which is the schema of a different existing tenant, so subsequent reads and writes for that tenant run against the other tenant's data.\n\nThis issue affects ash_postgres: from 0.25.0 before 2.13.0."
                        }
                    ],
                    "value": "Unchecked Return Value vulnerability in ash-project ash_postgres allows a user who can drive a tenant rename to a name that collides with an existing tenant's schema to have their tenant record repointed at that other tenant's live schema, gaining access to its data.\n\nAshPostgres.MultiTenancy.rename_tenant/3 issues the ALTER SCHEMA ... RENAME TO ... with the non-raising Ecto.Adapters.SQL.query/2, discards its {:ok, _} | {:error, _} result, and unconditionally returns :ok. PostgreSQL rejects the rename when the target schema already exists (and on insufficient privilege or lock timeout), but that failure never reaches the caller. The calling manage_tenant update action therefore sees success and commits the tenant row with the new name, which is the schema of a different existing tenant, so subsequent reads and writes for that tenant run against the other tenant's data.\n\nThis issue affects ash_postgres: from 0.25.0 before 2.13.0."
                }
            ],
            "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": "LOCAL",
                        "baseScore": 7.2,
                        "baseSeverity": "HIGH",
                        "privilegesRequired": "LOW",
                        "providerUrgency": "NOT_DEFINED",
                        "subAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "valueDensity": "NOT_DEFINED",
                        "vectorString": "CVSS:4.0/AV:L/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-252",
                            "description": "CWE-252 Unchecked Return Value",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
                "shortName": "EEF",
                "dateUpdated": "2026-08-30T15:13:23.875Z"
            },
            "references": [
                {
                    "tags": [
                        "vendor-advisory",
                        "related"
                    ],
                    "url": "https://github.com/ash-project/ash_postgres/security/advisories/GHSA-6fqq-j9c4-5766"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://cna.erlef.org/cves/CVE-2026-78699.html"
                },
                {
                    "tags": [
                        "related"
                    ],
                    "url": "https://osv.dev/vulnerability/EEF-CVE-2026-78699"
                },
                {
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/ash-project/ash_postgres/commit/8544ab15fe45784553c2d2da8ee1a388eee0174b"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "title": "rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres"
        }
    }
}