CVE-2026-115635 - AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set

CVE-2026-115635 - AshPostgres returns another tenant's record for a skipped upsert when return_skipped_upsert? is set

https://cvefeed.io/rssfeed/latest.atom / Mon, 10/26/2026 - 07:11
CVE ID :CVE-2026-115635
Published : Oct. 25, 2026, 8:16 p.m. | 8 hours, 6 minutes ago
Description :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.
Severity: 6.0 | MEDIUM
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