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.

Project Subscriptions

Vendors Products
Ash-project Subscribe
Ash Sql Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sun, 30 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
Description 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.
Title exists/2 predicate silently dropped on limited relationships with a parent() filter in AshSql
First Time appeared Ash-project
Ash-project ash Sql
Weaknesses CWE-863
CPEs cpe:2.3:a:ash-project:ash_sql:*:*:*:*:*:*:*:*
Vendors & Products Ash-project
Ash-project ash Sql
References
Metrics cvssV4_0

{'score': 5.9, 'vector': '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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: EEF

Published:

Updated: 2026-08-30T12:01:23.862Z

Reserved: 2026-08-30T04:45:01.559Z

Link: CVE-2026-77454

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-30T12:17:17.273

Modified: 2026-08-30T12:17:17.273

Link: CVE-2026-77454

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-30T14:00:15Z

Weaknesses