{"affected":[{"package":{"ecosystem":"Hex","name":"ash_admin","purl":"pkg:hex/ash_admin"},"ranges":[{"events":[{"introduced":"0.1.0"},{"fixed":"1.3.1"}],"type":"SEMVER"}],"versions":["0.1.0","0.1.2","0.1.3","0.1.5","0.1.6","0.2.1","0.2.3","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16-rc.0","0.2.16-rc.1","0.2.17","0.2.18","0.2.19","0.2.20","0.2.21","0.2.22","0.3.0-rc.0","0.4.0","0.4.2","0.4.4","0.4.5-rc.0","0.5.0","0.5.1-rc.0","0.5.2","0.6.0-rc.0","0.6.0-rc.1","0.6.0-rc.2","0.6.1","0.6.2","0.7.0","0.7.1","0.8.0","0.8.1","0.9.0","0.9.1","0.9.2","0.9.3","0.9.4","0.9.5","0.9.6","0.9.7","0.9.8","0.10.0","0.10.1","0.10.2","0.10.3","0.10.4","0.10.5","0.10.6","0.10.7","0.10.8","0.10.9","0.10.10-rc.0","0.10.10-rc.1","0.10.10","0.10.11","0.10.12","0.11.0","0.11.1","0.11.2","0.11.3","0.11.4","0.11.5","0.11.6","0.11.7","0.11.8","0.11.9","0.11.10","0.11.11","0.12.0","0.12.1","0.12.2","0.12.3","0.12.4","0.12.5","0.12.6","0.13.0","0.13.1","0.13.2","0.13.3","0.13.4","0.13.5","0.13.6","0.13.7","0.13.8","0.13.9","0.13.10","0.13.11","0.13.12","0.13.13","0.13.14","0.13.15","0.13.16","0.13.17","0.13.18","0.13.19","0.13.20","0.13.21","0.13.22","0.13.23","0.13.24","0.13.25","0.13.26","0.14.0","1.0.0-rc.0","1.1.0","1.2.0","1.3.0"]},{"ranges":[{"events":[{"introduced":"98b03baa8422b94dd13e305bf08b8ee3f7232c7b"},{"fixed":"3c3e905d47f1155dcc1ca3fb347348b05a66065a"}],"repo":"https://github.com/ash-project/ash_admin","type":"GIT"}]}],"aliases":["GHSA-jxr8-hpv2-qp38","CVE-2026-81853"],"credits":[{"name":"Peter Ullrich","type":"FINDER"},{"name":"Peter Ullrich","type":"REPORTER"},{"name":"Zach Daniel / Ash Project","type":"REMEDIATION_DEVELOPER"},{"name":"Jonatan Männchen / EEF","type":"COORDINATOR"}],"database_specific":{"capec_ids":["CAPEC-77"],"cpe_ids":["cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-639"]},"details":"## Summary\n\nAuthorization Bypass Through User-Controlled Key vulnerability in ash-project ash_admin turns a record-lookup URL into an equality oracle over sensitive attributes.\n\n`AshAdmin.Helpers.decode_primary_key/2` decodes the composite-primary-key form (Base64 plus ETF) and returns the decoded map verbatim as the lookup filter, without checking that its keys are the resource's primary-key fields. The deserialization guards bound size, block new atoms and funs, and reject nested expressions, but none restricts which fields come back, and `:safe` still allows any already-interned attribute name. An attacker can therefore encode `%{api_token: \"guess\"}` and have it spliced into the lookup filter, brute-forcing a sensitive attribute value (API token, reset token) one equality guess at a time; `Map.to_list/1` also accepts structs, yielding a bogus `__struct__` key. The fix rejects any decoded key that is not a real primary-key field.\n\nThis issue affects ash_admin: from 0.1.0 before 1.3.1.\n\n## Configurations\n\nThe resource has a composite primary key, and the deployment relies on AshAdmin's authorization (a custom actor plug and policies) so that reading otherwise-restricted attribute values crosses a boundary.","id":"EEF-CVE-2026-81853","modified":"2026-09-08T03:15:01.970198Z","published":"2026-08-31T02:31:29.547Z","references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_admin/security/advisories/GHSA-jxr8-hpv2-qp38"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-81853.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_admin/commit/3c3e905d47f1155dcc1ca3fb347348b05a66065a"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_admin"}],"related":[],"schema_version":"1.7.3","severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"}],"summary":"AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attribute oracle","upstream":[]}