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EEF-CVE-2026-115627
Summary
Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to load destination records linked to a source record only through another tenant's join rows.
When a many_to_many relationship, or a through relationship, is loaded with a lateral join (for example with a per-record limit or sort), AshPostgres.DataLayer builds the query for the join resource, and for each resource along a through path, in lateral_join_query/3 and through_step_queries/4 without running that resource's read action, which is where attribute multitenancy is applied. When those resources use strategy :attribute multitenancy, rows belonging to other tenants were joined, so the load returned destination records that the caller's tenant is not related to.
This issue affects ash_postgres: from 0.38.0 before 2.15.2.
Impact
A user of one tenant loading a many_to_many or through relationship receives destination records linked only through another tenant's join rows.
Configurations
Reachable when the join resource of a many_to_many relationship, or a resource along a through path, uses attribute multitenancy and holds rows from several tenants, and the relationship is loaded with a lateral join (for example with a limit, offset or sort on the relationship).
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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