# CVE-2026-75757: ash-project ash_admin session hijacking via cookie shadowing

Source: https://junglewise.ai/threats/cve-2026-75757-ash-project-ash-admin-session-hijacking-via-cookie-shadowing  
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-2026-75757 · Severity: info · Published 2026-08-31

ash_admin is a web-based administration interface used to manage Ash Framework applications. An attacker who controls a sibling subdomain can forge cookies that override legitimate session state, allowing them to hijack an administrator's session and impersonate them with different permissions, tenants, or authorization modes. This could lead to unauthorized administrative access and data compromise.

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

## Quick answers

**Is CVE-2026-75757 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-75757 being exploited in the wild.

**How severe is CVE-2026-75757?** Informational severity, published 31 August 2026.

**Which products and versions are affected?** Ash-Project Ash Admin 0.9.1 to before 1.3.1.

**Is there a fix for CVE-2026-75757?** 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-2026-75757 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-75757?** Check whether you run Ash-Project Ash Admin 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 a cookie validation failure (CWE-347) in ash_admin's client-side JavaScript. The code reads session-state cookies by matching cookie names against document.cookie using an unanchored regular expression (new RegExp(name + "=([^;]+)")), which matches any cookie whose name merely ends with the requested name. Since cookies are shared across a registrable domain via the Domain attribute, a compromised sibling subdomain can set shadowing cookies (e.g., "xactor_authorizing" to match "actor_authorizing") that flow unvalidated into the LiveSocket connect parameters. No authentication is required; the attack vector is network-based and depends only on subdomain compromise. The fix validates cookie names by exact equality rather than substring matching.

## Affected products

- ash-project ash_admin 0.9.1 to before 1.3.1

## 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_admin resource exhaustion in LiveView handlers](https://junglewise.ai/threats/cve-2026-82722-ash-project-ash-admin-resource-exhaustion-in-liveview-handlers)
- [ash-project ash_admin improper output encoding in row-action links](https://junglewise.ai/threats/cve-2026-82681-ash-project-ash-admin-improper-output-encoding-in-row-action)
- [ash-project ash_admin path traversal in file upload](https://junglewise.ai/threats/cve-2026-82673-ash-project-ash-admin-path-traversal-in-file-upload)
- [ash-project ash_admin authorization bypass via user-controlled key](https://junglewise.ai/threats/cve-2026-81853-ash-project-ash-admin-authorization-bypass-via-user-controlled)
- [ash-project ash_admin hardcoded CSP nonce bypass](https://junglewise.ai/threats/cve-2026-81852-ash-project-ash-admin-hardcoded-csp-nonce-bypass)