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CVE-2026-81852— AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass

Quick assessment

Affected
ash-project ash_admin
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ash Framework AshAdmin是Ash Framework组织的一款管理后台界面工具。 Ash Framework AshAdmin 0.10.8至1.3.1之前版本存在加密问题漏洞，该漏洞源于使用不充分随机值，即默认硬编码了公开已知的CSP nonce，导致基于nonce的内容安全策略保护失效，可能允许攻击者通过HTML注入重用已知nonce执行内联脚本。

CVSS 2.1 · Low EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_admin 0.10.8< 1.3.1 affected
99b8daed7b2f79d82fcd9e89338d41b0e1564aa7< bc7a1cdf873b16971a8efec35d085f8bb706314f affected
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I. Basic Information for CVE-2026-81852

Vulnerability Information
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Vulnerability Title
AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework AshAdmin 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework AshAdmin是Ash Framework组织的一款管理后台界面工具。 Ash Framework AshAdmin 0.10.8至1.3.1之前版本存在加密问题漏洞，该漏洞源于使用不充分随机值，即默认硬编码了公开已知的CSP nonce，导致基于nonce的内容安全策略保护失效，可能允许攻击者通过HTML注入重用已知nonce执行内联脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_admin 0.10.8 ~ 1.3.1 cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*
ash-project ash_admin 99b8daed7b2f79d82fcd9e89338d41b0e1564aa7 ~ bc7a1cdf873b16971a8efec35d085f8bb706314f cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-81852

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III. Intelligence Information for CVE-2026-81852

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Patches & Fixes for CVE-2026-81852 (1)

Vendor Advisories for CVE-2026-81852 (1)

Other References for CVE-2026-81852 (2)

Same Patch Batch · ash-project · 2026-08-31 · 17 CVEs total

CVE-2026-77956 8.9 HIGH EEx template evaluation of prompt content in AshAi enables remote code execution
CVE-2026-77850 8.4 HIGH Stored XSS in AshAdmin relationship typeahead via unescaped label_field content
CVE-2026-75757 8.3 HIGH AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a
CVE-2026-82722 8.3 HIGH AshAdmin LiveView events intern atoms from client input, exhausting the atom table (node D
CVE-2026-82673 8.3 HIGH Path traversal in AshAdmin file uploads via unsanitized client filename
CVE-2026-82724 7.6 HIGH Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain
CVE-2026-81315 7.4 HIGH MCP DNS-rebinding origin check in AshAi is bypassed by a spoofed X-Forwarded-Proto header
CVE-2026-75760 7.1 HIGH AshAi vectorize change leaks raw embedding-provider errors, including credentials, in a us
CVE-2026-82564 7.1 HIGH Identity tool filter in AshAi accepts operator maps, allowing update or destroy of unident
CVE-2026-82726 6.3 MEDIUM AshPhoenix get_subdomain maps a crafted or differently-cased Host header to an arbitrary t
CVE-2026-82579 6.0 MEDIUM AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of
CVE-2026-82580 5.3 MEDIUM AshAi echoes raw tool exception messages into the conversation, disclosing internal detail
CVE-2026-81853 2.3 LOW AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attrib
CVE-2026-82725 2.3 LOW AshPhoenix FilterForm allows filtering across non-public relationships, disclosing private
CVE-2026-82727 2.3 LOW AshPhoenix Form.Auto leaks submitted params in an unknown _union_type error message
CVE-2026-82681 2.0 LOW Query-parameter injection in AshAdmin row-action links via unencoded string primary keys

IV. Related Vulnerabilities

Same product: ash_admin
Same vendor: ash-project
Same weakness: CWE-330

V. Comments for CVE-2026-81852

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