TI-2026-80112 Aliases CVE-2026-115627

AshPostgres skips attribute multitenancy in many_to_many loads

LOW 26CWE-863Published 2026-10-25 · Updated 2026-10-26

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Security bypass
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

Incorrect authorization in ash_postgres from 0.38.0 before 2.15.2 lets a user load destination records through join rows that belong to other tenants. When a many_to_many or through relationship is loaded with a lateral join, AshPostgres builds the query for the join resource and each resource along a through path without running that resource's read action, which is where attribute multitenancy is applied. A user with low privileges can therefore receive records that their own tenant is not related to, with high confidentiality impact.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00246 15th percentileScored 2026-11-07

Fix Fixed ash_postgres (ash-project): 2.15.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ash-project	ash_postgres	0.38.0 to before 2.15.2	2.15.2	Patch available	CNA

ash_postgres Vendorash-project Affected 0.38.0 to before 2.15.2 Fixed in 2.15.2 Patch available CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:ash-project:ash_postgres::::::::	—	—	—

cpe:2.3:a:ash-project:ash_postgres:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

Upgrade ash_postgres to 2.15.2, the fixed version. No other fixed version is listed.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Fix · CNA ash_postgres (ash-project) Fixed in 2.15.2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-10-25
ash-project ash_postgres 2.15.2
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-80113 AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is setPriority LOW 26
Show all 2 records →

Timeline

2026-10-25 Threatist record created from CVE-2026-115627
2026-10-26 CISA SSVC decision points changed
2026-10-26 Priority changed: MEDIUM → LOW

References

Patch 1

Fix commit 8c25c94 in ash-project/ash_postgres

Advisory 1

AshPostgres ignores attribute multitenancy on the join resource when loading `many_to_many` and `through` relationships, returning records related through other tenants' rows

Other 3

TI-2026-56298 Query-complexity limit bypass via first/last pagination arguments in AshGraphql enables denial of service CVSS 4.0HIGH 8.7
TI-2026-52572 Unbounded atom creation from client-supplied RPC field names in AshTypescript field formatter CVSS 4.0HIGH 8.7
TI-2026-57010 Path traversal in AshAdmin file uploads via unsanitized client filename CVSS 4.0HIGH 8.3
TI-2026-26840 Ash Framework: Ash.Type.Module.cast_input/2 atom exhaustion via unchecked Module.concat allows BEAM VM crash CVSS 4.0HIGH 8.2
TI-2026-54252 EEx template evaluation of prompt content in AshAi enables remote code execution CVSS 4.0HIGH 8.9
TI-2026-54208 Stored XSS in AshAdmin relationship typeahead via unescaped label_field content CVSS 4.0HIGH 8.4

See all 90 →

Sources

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