CVE-2026-81852
AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass
- State
- Published
- Severity
- 2.1 Low
- Published
- Aug 31, 2026
- Updated
- Aug 31, 2026
- Reserved
- Aug 30, 2026
Description
Use of Insufficiently Random Values vulnerability in ash-project ash_admin ships a hardcoded, publicly known CSP nonce, defeating nonce-based Content-Security-Policy protection.
When mounted without :csp_nonce_assign_key, AshAdmin.Router.ash_admin/2 defaulted the img, style, and script nonces to the literal constant ash_admin-Ed55GFnX, which AshAdmin.Layouts wrote verbatim into the nonce attribute of its inline <style> and <script> tags on every response. The value is a compile-time constant published in the repository and is never rotated per request. If an application's CSP script-src allow-lists that documented default, any HTML-injection sink on an admin page can reuse the known nonce to run inline scripts the policy was meant to block. The fix generates a fresh random nonce per request.
This issue affects ash_admin: from 0.10.8 before 1.3.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.1 Low | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | EEF |
Weaknesses
- CWE-330 Use of Insufficiently Random Values
Affected Products
| Product | Versions |
|---|---|
ash_adminash-project |
|
ash_adminash-project |
|
References
- https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597vendor-advisoryrelated
- https://cna.erlef.org/cves/CVE-2026-81852.htmlrelated
- https://osv.dev/vulnerability/EEF-CVE-2026-81852related
- https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314fpatch
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