CVE-2026-115635

Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert. When Ash.bulk_create/4 or a single create runs as an upsert with return_skipped_upsert?: true and the upsert is skipped (for example because its upsert_condition does not hold), AshPostgres.DataLayer reads the existing row back by the upsert identity in do_bulk_create/3 and upsert/4. That lookup did not apply the resource's attribute multitenancy, so on a resource using strategy :attribute it could match and return the row of another tenant with the same identity values, exposing its fields to the caller. This issue affects ash_postgres: from 2.6.22 before 2.15.2.

• https://github.com/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w
• https://github.com/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9
• https://github.com/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5

• https://cna.erlef.org/cves/CVE-2026-115635.html
• https://github.com/ash-project/ash/security/advisories/GHSA-36hg-wwp2-fg8w
• https://github.com/ash-project/ash_postgres/commit/8aa81220c401cae412d21078d11b3519ea25d3a9
• https://github.com/ash-project/ash_postgres/commit/af0903f1380468bbe1b61fe65acb33772b5e24a5
• https://osv.dev/vulnerability/EEF-CVE-2026-115635

• HIGHCVE-2024-22031PoC
• MEDIUMCVE-2026-100145
• MEDIUMCVE-2026-100259
• HIGHCVE-2026-100262
• LOWCVE-2026-100270
• HIGHCVE-2026-100273
• MEDIUMCVE-2026-100276
• HIGHCVE-2026-100277

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