CVE-2026-81853— AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attribute oracle
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_admin 中通过用户可控密钥绕过授权的漏洞 Ash-project 的 ash_admin 将记录查询 URL 变成了针对敏感属性的“相等性预言机”（equality oracle）。 具体来说， 函数会对组合主键格式（Base64 加 ETF）进行解码，并原样将解码后的映射（map）作为查询过滤器返回，而没有验证其中的键是否为该资源的主键字段。反序列化守卫机制虽然限制了数据大小、禁止新增 atom 和 fun，并拒绝嵌套表达式，且 模式仍允许任意已内省（interned）的属性名，但没有任何机制限制返回
Possible ATT&CK Techniques 2 AI
T1140 · Deobfuscate/Decode Files or Information T1598 · Phishing for Information
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I. Basic Information for CVE-2026-81853
Vulnerability Information
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Vulnerability Title
AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attribute oracle
Source: CVE Program / CVE List V5
Vulnerability Description
Authorization Bypass Through User-Controlled Key vulnerability in ash-project ash_admin turns a record-lookup URL into an equality oracle over sensitive attributes.
AshAdmin.Helpers.decode_primary_key/2 decodes the composite-primary-key form (Base64 plus ETF) and returns the decoded map verbatim as the lookup filter, without checking that its keys are the resource's primary-key fields. The deserialization guards bound size, block new atoms and funs, and reject nested expressions, but none restricts which fields come back, and :safe still allows any already-interned attribute name. An attacker can therefore encode %{api_token: "guess"} and have it spliced into the lookup filter, brute-forcing a sensitive attribute value (API token, reset token) one equality guess at a time; Map.to_list/1 also accepts structs, yielding a bogus __struct__ key. The fix rejects any decoded key that is not a real primary-key field.
This issue affects ash_admin: from 0.1.0 before 1.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| ash-project | ash_admin | 0.1.0 ~ 1.3.1 |
cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*
|
|
| ash-project | ash_admin | 98b03baa8422b94dd13e305bf08b8ee3f7232c7b ~ 3c3e905d47f1155dcc1ca3fb347348b05a66065a |
cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*
|
|
II. Public POCs for CVE-2026-81853
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-81853 (4)
-
https://github.com/ash-project/ash_admin/security/advisories/GHSA-jxr8-hpv2-qp38 vendor-advisory related
Same Patch Batch · ash-project · 2026-08-31 · 13 CVEs total
| CVE-2026-77956 | 10.0 CRITICAL | 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-2026-82673 | 8.3 HIGH | Path traversal in AshAdmin file uploads via unsanitized client filename |
| CVE-2026-82722 | 8.3 HIGH | AshAdmin LiveView events intern atoms from client input, exhausting the atom table (node D |
| CVE-2026-75757 | 8.3 HIGH | AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a |
| 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-2026-82579 | 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-2026-81852 | 2.1 LOW | AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass |
| 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
-
CVE-2026-82673
Path traversal in AshAdmin file uploads via unsanitized clie -
CVE-2026-81852
AshAdmin ships a hardcoded CSP nonce, allowing nonce-based C -
CVE-2026-82681
Query-parameter injection in AshAdmin row-action links via u -
CVE-2026-77850
Stored XSS in AshAdmin relationship typeahead via unescaped -
CVE-2026-82722
AshAdmin LiveView events intern atoms from client input, exh
Same vendor: ash-project
-
CVE-2026-82673
Path traversal in AshAdmin file uploads via unsanitized clie -
CVE-2026-81852
AshAdmin ships a hardcoded CSP nonce, allowing nonce-based C -
CVE-2026-82681
Query-parameter injection in AshAdmin row-action links via u -
CVE-2026-77850
Stored XSS in AshAdmin relationship typeahead via unescaped -
CVE-2026-82722
AshAdmin LiveView events intern atoms from client input, exh
Same weakness: CWE-639
-
CVE-2026-82602
SeaCMS ass.php authorization -
CVE-2026-82564
Identity tool filter in AshAi accepts operator maps, allowin -
CVE-2026-55867
Graylog token revocation endpoint allows authenticated users -
CVE-2026-19294
Langflow is affected by multiple authentication bypass, path -
CVE-2026-18904
Langflow is affected by multiple authentication bypass, path
V. Comments for CVE-2026-81853
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