Vulnerability Description
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.
Related Weaknesses (CWE)
References
- https://cna.erlef.org/cves/CVE-2026-96581.html
- https://github.com/ash-project/ash/commit/2333d01ddf37e5909769a513059b27e3183331
- https://github.com/ash-project/ash/commit/c9f0cdb31e7c084def05f3f5be69dd7bb77217
- https://github.com/ash-project/ash/security/advisories/GHSA-vw7c-67pf-gh96
- https://osv.dev/vulnerability/EEF-CVE-2026-96581
FAQ
What is CVE-2026-96581?
CVE-2026-96581 is a documented vulnerability. 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. ...
How severe is CVE-2026-96581?
CVSS scoring is not yet available for CVE-2026-96581. Check NVD for updates.
Is there a patch for CVE-2026-96581?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.