Vulnerability · Published Aug 31, 2026 · Assigned by EEF
CVE-2026-81852AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass
Low 2.1
In plain English
A low-severity weak randomness in ash_admin from ash-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ash-project | ash_admin | 0.10.8 – before 1.3.1 |
| ash-project | ash_admin | 99b8daed7b2f79d82fcd9e89338d41b0e1564aa7 – before bc7a1cdf873b16971a8efec35d085f8bb706314f |
Weakness: CWE-330 · Vector: 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
References
- https://github.com/ash-project/ash_admin/security/advisories/GHSA-whfj-rrrp-j597 vendor-advisory, related
- https://cna.erlef.org/cves/CVE-2026-81852.html related
- https://osv.dev/vulnerability/EEF-CVE-2026-81852 related
- https://github.com/ash-project/ash_admin/commit/bc7a1cdf873b16971a8efec35d085f8bb706314f patch