{"id":"CVE-2026-78699","summary":"rename_tenant returns :ok on a failed rename, enabling cross-tenant access in AshPostgres","details":"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.","aliases":["EEF-CVE-2026-78699","GHSA-6fqq-j9c4-5766"],"modified":"2026-09-02T03:30:34.623259307Z","published":"2026-08-30T15:13:23.875Z","database_specific":{"cna_assigner":"EEF","cwe_ids":["CWE-252"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78699.json","unresolved_ranges":[{"extracted_events":[{"introduced":"0.25.0"},{"fixed":"2.13.0"},{"introduced":"03510dae24020e302558ef947be7ea874a9ce756"},{"fixed":"8544ab15fe45784553c2d2da8ee1a388eee0174b"}],"source":"AFFECTED_FIELD"},{"extracted_events":[{"introduced":"0.25.0"},{"fixed":"2.13.0"}],"source":"CPE_FIELD"},{"extracted_events":[{"introduced":"0.25.0"},{"fixed":"2.13.0"}],"source":"DESCRIPTION"}]},"references":[{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-78699.html"},{"type":"WEB","url":"https://github.com"},{"type":"WEB","url":"https://osv.dev/vulnerability/EEF-CVE-2026-78699"},{"type":"WEB","url":"https://repo.hex.pm"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/78xxx/CVE-2026-78699.json"},{"type":"ADVISORY","url":"https://github.com/ash-project/ash_postgres/security/advisories/GHSA-6fqq-j9c4-5766"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78699"},{"type":"FIX","url":"https://github.com/ash-project/ash_postgres/commit/8544ab15fe45784553c2d2da8ee1a388eee0174b"},{"type":"PACKAGE","url":"https://github.com/ash-project/ash_postgres"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_postgres","events":[{"introduced":"0"},{"fixed":"8544ab15fe45784553c2d2da8ee1a388eee0174b"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v2.12.0","v2.11.0","v2.10.0","v2.9.1","v2.9.0","v2.8.0","v2.7.0","v2.6.32","v2.6.31","v2.6.30","v2.6.29","v2.6.28","v2.6.27","v2.6.26","v2.6.25","v2.6.24","v2.6.23","v2.6.22","v2.6.21","v2.6.20","v2.6.19","v2.6.18","v2.6.17","v2.6.16","v2.6.15","v2.6.14","v2.6.13","v2.6.12","v2.6.11","v2.6.10","v2.6.9","v2.6.8","v2.6.7","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.22","v2.5.21","v2.5.20","v2.5.19","v2.5.18","v2.5.17","v2.5.16","v2.5.15","v2.5.14","v2.5.13","v2.5.12","v2.5.11","v2.5.10","v2.5.9","v2.5.8","v2.5.7","v2.5.6","v2.5.5","v2.5.4","v2.5.3","v2.5.2","v2.5.1","v2.5.0","v2.4.22","v2.4.21","v2.4.20","v2.4.19","v2.4.18","v2.4.17","v2.4.16","v2.4.14","v2.4.13","v2.4.12","v2.4.11","v2.4.10","v2.4.9","v2.4.8","v2.4.7","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.1","v2.3.0","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.19","v2.1.18","v2.1.17","v2.1.15","v2.1.14","v2.1.13","v2.1.12","v2.1.11","v2.1.10","v2.1.9","v2.1.8","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.0.12","v2.0.11","v2.0.10","v2.0.9","v2.0.8","v2.0.7","v2.0.4","v2.0.3","v2.0.2","v2.0.0-rc.15","v2.0.0-rc.14","v2.0.0-rc.13","v2.0.0-rc.12","v2.0.0-rc.11","v2.0.0-rc.10","v2.0.0-rc.9","v2.0.0-rc.8","v2.0.0-rc.7","v2.0.0-rc.6","v2.0.0-rc.5","v2.0.0-rc.4","v2.0.0-rc.3","v2.0.0-rc.2","v1.5.22","v2.0.0-rc.1","v2.0.0-rc.0","v1.5.21","v1.5.20","v1.5.19","v1.5.17","v1.5.16","v1.5.15","v1.5.14","v1.5.13","v1.5.12","v1.5.11","v1.5.10","v1.5.9","v1.5.8","v1.5.7","v1.5.6","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.68","v1.3.67","v1.3.66","v1.3.65","v1.3.64","v1.3.63","v1.3.62","v1.3.61","v1.3.60","v1.3.59","v1.3.58","v1.3.57","v1.3.56","v1.3.55","v1.3.54","v1.3.53","v1.3.51","v1.3.50","v1.3.49","v1.3.48","v1.3.47","v1.3.46","v1.3.45","v1.3.44","v1.3.43","v1.3.42","v1.3.41","v1.3.40","v1.3.39","v1.3.38","v1.3.37","v1.3.36","v1.3.35","v1.3.34","v1.3.33","v1.3.32","v1.3.31","v1.3.30","v1.3.29","v1.3.28","v1.3.27","v1.3.26","v1.3.25","v1.3.24","v1.3.23","v1.3.22","v1.3.21","v1.3.20","v1.3.19","v1.3.18","v1.3.17","v1.3.16","v1.3.15","v1.3.14","v1.3.13","v1.3.12","v1.3.11","v1.3.10","v1.3.9","v1.3.8","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.3.0-rc.4","v1.3.0-rc.3","v1.3.0-rc.2","v1.3.0-rc.1","v1.3.0-rc.0","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.2.0-rc.1","v1.2.0-rc.0","v1.1.3","v1.1.2","v1.1.1","v1.1.0","v1.0.0","v1.0.0-rc.9","v1.0.0-rc.8","v1.0.0-rc.7","v1.0.0-rc.6","v1.0.0-rc.5","v1.0.0-rc.4","v1.0.0-rc.3","v1.0.0-rc.2","v1.0.0-rc.1","v1.0.0-rc.0","v0.43.0","v0.42.0-rc.7","v0.42.0-rc.6","v0.42.0-rc.5","v0.42.0-rc.4","v0.42.0-rc.3","v0.42.0-rc.2","v0.42.0-rc.1","v0.42.0-rc.0","v0.41.7","v0.41.6","v0.41.5","v0.41.4","v0.41.3","v0.41.2","v0.41.1","v0.41.0-rc.9","v0.41.0-rc.8","v0.41.0-rc.7","v0.41.0-rc.6","v0.41.0-rc.5","v0.41.0-rc.4","v0.41.0-rc.3","v0.41.0-rc.2","v0.41.0-rc.1","v0.41.0-rc0","v0.40.11","v0.40.10","v0.40.9","v0.40.8","v0.40.7","v0.40.6","v0.40.5","v0.40.4","v0.40.3","v0.40.2","v0.40.1","v0.40.0-rc5","v0.40.0-rc4","v0.40.0-rc3","v0.40.0-rc2","v0.40.0-rc1","v0.39.0-rc0","v0.38.11","v0.38.10","v0.38.9","v0.38.8","v0.38.7","v0.38.6","v0.38.5","v0.38.4","v0.38.3","v0.38.2","v0.38.1","v0.38.0","v0.37.8","v0.37.7","v0.37.6","v0.37.4","v0.37.3","v0.37.2",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