Medium
AshPostgres ignores attribute multitenancy on the join resource when loading many_to_many and through relationships, returning records related through other tenants' rows
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-115627
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 19:27 UTC · Revision 1
Source evidence
AshPostgres ignores attribute multitenancy on the join resource when loading many_to_many and through relationships, returning records related through other tenants' rows
core-osv · Original sourcePublished 25 Oct 2026, 19:49 UTC
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.
osv:CVE-2026-115627
Complete source record
{
"id": "adea4269455dbf734d9fe396ed7a6d759ee622ca07a2efa35626888b22b82762",
"url": "https://osv.dev/vulnerability/CVE-2026-115627",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "AshPostgres ignores attribute multitenancy on the join resource when loading many_to_many and through relationships, returning records related through other tenants' rows",
"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.",
"evidence": "osv:CVE-2026-115627",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-115627",
"aliases": [
"CVE-2026-115627",
"EEF-CVE-2026-115627",
"GHSA-gr2r-f49c-9gm2"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
}
],
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{
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"database_specific": {
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}
}
],
"modified": "2026-10-28T02:30:31.564363448Z",
"provider": "osv",
"references": [
"https://cna.erlef.org/cves/CVE-2026-115627.html",
"https://github.com",
"https://osv.dev/vulnerability/EEF-CVE-2026-115627",
"https://repo.hex.pm",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115627.json",
"https://github.com/ash-project/ash/security/advisories/GHSA-gr2r-f49c-9gm2",
"https://nvd.nist.gov/vuln/detail/CVE-2026-115627",
"https://github.com/ash-project/ash_postgres/commit/7115bec58678f13b1ac2fb4822a0ba1aea9dbec5",
"https://github.com/ash-project/ash_postgres/commit/8c25c945c39a45299193fe70b09fc2fa2aacac7b",
"https://github.com/ash-project/ash_postgres"
],
"provider_metadata": {
"cwe_ids": [
"CWE-863"
],
"cna_assigner": "EEF",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115627.json"
}
},
"related_cves": [
{
"value": "CVE-2026-115627",
"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498700,
"published_at": "2026-10-25T19:49:50.51+00:00"
}