CVE-2026-77454
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
Summary
Incorrect 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.
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.
This issue affects ash_sql: from 0.4.1 before 0.7.1.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ash-project | ash_sql | 0.4.1 < 0.7.1 | affected |
| ash-project | ash_sql | e26a63b29bd7501505fafd726f14262cdc3b6629 < 865fdd4e5e70724a23b19c048e6768c31d2209ab | affected |
Weaknesses
- CWE-863: CWE-863 Incorrect Authorization
References
- https://github.com/ash-project/ash_sql/security/advisories/GHSA-8v9m-8pxv-738c
- https://cna.erlef.org/cves/CVE-2026-77454.html
- https://osv.dev/vulnerability/EEF-CVE-2026-77454
- https://github.com/ash-project/ash_sql/commit/865fdd4e5e70724a23b19c048e6768c31d2209ab
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