AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass (CVE-2026-81852) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-81852

AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass

Answer in brief

CVE-2026-81852 records a Unknown severity vulnerability in AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass. The current sources do not mark it as known exploited. The current feed maps ash-project/ash_admin (generic), ash-project/ash_admin (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 31, 2026Updated Aug 31, 2026Source checked Aug 31, 2026First seen by HOL Aug 31, 2026Material review Aug 31, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps ash-project/ash_admin (generic), ash-project/ash_admin (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
ash-project/ash_admingeneric	>=0.10.8 <1.3.1	1.3.1
ash-project/ash_admingeneric	>=99b8daed7b2f79d82fcd9e89338d41b0e1564aa7 <bc7a1cdf873b16971a8efec35d085f8bb706314f	bc7a1cdf873b16971a8efec35d085f8bb706314f

Recommended response

Check inventory. Check lockfiles and deployed manifests for ash-project/ash_admin, ash-project/ash_admin.
Review the reported fix. Update ash-project/ash_admin to 1.3.1; ash-project/ash_admin to bc7a1cdf873b16971a8efec35d085f8bb706314f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 31, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.