{"id":"EEF-CVE-2026-77454","summary":"exists/2 predicate silently dropped on limited relationships with a parent() filter in AshSql","details":"## Summary\n\nIncorrect Authorization vulnerability in ash-project ash_sql allows a caller to bypass a scoping or authorization filter expressed as `exists/2` over a relationship that declares both a limit (or `from_many?`) and a `parent(...)`-referencing filter or sort.\n\n`AshSql.Join.related_query/3` skips the caller-supplied `exists` predicate for such relationships and delegates it to `limit_from_many/5`. When the relationship's own filter or sort references `parent(...)`, `limit_from_many/5` takes a branch that drops both the limit and the predicate, emitting a bare correlated `EXISTS` with no predicate. The check then matches any record that has any related row. Most severely, when the expression backs a policy (for example `authorize_if expr(exists(memberships, user_id == ^actor(:id)))`), the actor-scoping condition disappears and the policy passes for any actor with any related row.\n\nThis issue affects ash_sql: from 0.4.1 before 0.7.1.\n\n## Configurations\n\nAn application must use `exists/2` (in a filter or a policy) over a relationship that declares both a limit or `from_many?` and a filter or sort that references `parent(...)`. The predicate supplied to `exists/2` is the one that is dropped.","aliases":["CVE-2026-77454","GHSA-8v9m-8pxv-738c"],"modified":"2026-09-08T03:45:08.467612171Z","published":"2026-08-30T12:01:23.862Z","database_specific":{"capec_ids":["CAPEC-1"],"cpe_ids":["cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*"],"cwe_ids":["CWE-863"]},"references":[{"type":"ADVISORY","url":"https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c"},{"type":"WEB","url":"https://cna.erlef.org/cves/CVE-2026-77454.html"},{"type":"FIX","url":"https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab"},{"type":"PACKAGE","url":"https://hex.pm/packages/ash_sql"}],"affected":[{"package":{"name":"ash_sql","ecosystem":"Hex","purl":"pkg:hex/ash_sql"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0.4.1"},{"fixed":"0.7.1"}]}],"versions":["0.4.1","0.4.2","0.4.3","0.4.4","0.4.5","0.5.0","0.5.1","0.5.2","0.5.3","0.5.4","0.5.5","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.6.7","0.6.8","0.6.9","0.7.0"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-77454.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ash-project/ash_sql","events":[{"introduced":"e26a63b29bd7501505fafd726f14262cdc3b6629"},{"fixed":"865fdd4e5e70724a23b19c048e6768c31d2209ab"}]}],"versions":["v0.7.0","v0.6.9","v0.6.8","v0.6.7","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.5","v0.4.4","v0.4.3","v0.4.2","v0.4.1"],"database_specific":{"source":"https://cna.erlef.org/osv/EEF-CVE-2026-77454.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}],"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"}]}