# CVE-2026-82724: ash-project ash_phoenix authorization bypass in SubdomainHook

Source: https://junglewise.ai/threats/cve-2026-82724-ash-project-ash-phoenix-authorization-bypass-in-subdomainhook  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-31. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-82724 · Severity: info · Published 2026-08-31

ash_phoenix is a Phoenix/LiveView integration library for the Ash data framework, used to build web applications with multi-tenant support. The vulnerability allows tenant-scoped authorization checks to be bypassed by invoking them with a nil tenant value, potentially granting unauthorized access to data across tenant boundaries. This breaks the core tenant isolation mechanism that protects customer data in multi-tenant applications.

Technologies: [Ash-Project Ash Phoenix](https://junglewise.ai/threats/technologies/ash-phoenix). Vendors: [Ash-Project](https://junglewise.ai/threats/vendors/ash-project).

## Quick answers

**Is CVE-2026-82724 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82724 being exploited in the wild.

**How severe is CVE-2026-82724?** Informational severity, published 31 August 2026.

**Which products and versions are affected?** Ash-Project Ash Phoenix 2.1.26 to before 2.3.25.

**Is there a fix for CVE-2026-82724?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-82724 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-82724?** Check whether you run Ash-Project Ash Phoenix at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an incorrect authorization/timing flaw in AshPhoenix.LiveView.SubdomainHook.on_mount/4. The hook attempts to assign the tenant and immediately call handle_subdomain within on_mount, but LiveView does not execute handle_params (where the tenant assign is set) until after on_mount returns. Consequently, handle_subdomain runs with a nil tenant, causing authorization checks that verify tenant membership to either crash or take a permissive default path. These checks are never re-evaluated once the real tenant is assigned or on subsequent navigations. The fix moves handle_subdomain invocation into the handle_params hook where the tenant is properly available on every navigation. Affected versions: ash_phoenix 2.1.26 before 2.3.25.

## Affected products

- ash-project ash_phoenix 2.1.26 to before 2.3.25

## Timeline

- 2026-08-31: disclosed

## References

- [https://repo.hex.pm/](https://repo.hex.pm/)
- [https://github.com/](https://github.com/)

## Related threats

- [ash-project ash_phoenix sensitive information in error messages](https://junglewise.ai/threats/cve-2026-82727-ash-project-ash-phoenix-sensitive-information-in-error-messages)
- [ash-project ash_phoenix regular expression tenant isolation bypass](https://junglewise.ai/threats/cve-2026-82726-ash-project-ash-phoenix-regular-expression-tenant-isolation)
- [ash-project ash_phoenix authorization bypass through user-controlled key](https://junglewise.ai/threats/cve-2026-82725-ash-project-ash-phoenix-authorization-bypass-through-user)