CVE-2026-96581

Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash allows a user of one tenant to read, overwrite and take over another tenant's records via an upserting create action. Under attribute multitenancy, Ash.Actions.Create (lib/ash/actions/create/create.ex) and Ash.Actions.Create.Bulk (lib/ash/actions/create/bulk.ex) upserted on the primary key, or on an all_tenants? identity, without scoping the conflicting record to the request's tenant. A caller of a create action with upsert? true that accepts the primary key, supplying a record id from another tenant, updated that record's upsert fields and received all of its attributes in the result. With the default upsert fields the tenant attribute was written too, moving the record into the caller's tenant. Read and update policies do not run for upserts, and tenant-scoped create policies pass because the tenant is the caller's own. This issue affects ash: from 1.22.0 before 3.37.2.

CVSS

No CVSS.

References

Link	Resource
https://cna.erlef.org/cves/CVE-2026-96581.html
https://github.com/ash-project/ash/commit/2333d01ddf37e5909769a513059b27e3183331c5
https://github.com/ash-project/ash/commit/c9f0cdb31e7c084def05f3f5be69dd7bb7721754
https://github.com/ash-project/ash/security/advisories/GHSA-vw7c-67pf-gh96
https://osv.dev/vulnerability/EEF-CVE-2026-96581

Configurations

No configuration.

History

26 Oct 2026, 08:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-26 08:17

Updated : 2026-10-26 15:16

NVD link : CVE-2026-96581

Mitre link : CVE-2026-96581

CVE.ORG link : CVE-2026-96581

JSON object : View

Products Affected

No product.

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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action.\n\nUnder attribute multitenancy, Ash.Actions.Create (lib/ash/actions/create/create.ex) and Ash.Actions.Create.Bulk (lib/ash/actions/create/bulk.ex) upserted on the primary key, or on an all_tenants? identity, without scoping the conflicting record to the request's tenant. 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