CVE WatchOct 25, 2026

CVE-2026-115635

Incorrect Authorization vulnerability in ash-project ash_postgres allows a user to read another tenant's record through a skipped upsert. W

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

0-100

Published: Oct 25, 2026 · Last modified: Oct 25, 2026 · CWE-863

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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