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CVE-2026-75757— AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain

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 0.9.1版本至1.3.1之前版本存在会话机制问题漏洞，该漏洞源于未对Cookie进行验证和完整性检查，使用未锚定正则表达式匹配Cookie名称，可能导致攻击者控制兄弟子域，通过设置影子Cookie将管理员会话重新绑定到不同的actor、租户或授权模式。

CVSS 8.3 · High EPSS 0.52% · P43

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1146

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_admin 0.9.1< 1.3.1 affected
77a43cc4fa04cb59c38fc434568a35a38ecb995a< e93a3408a85035e1f90275d02bc2470c96095e56 affected
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I. Basic Information for CVE-2026-75757

Vulnerability Information
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Vulnerability Title
AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a sibling subdomain
Source: CVE Program / CVE List V5
Vulnerability Description
Reliance on Cookies without Validation and Integrity Checking vulnerability in ash-project ash_admin lets an attacker who controls a sibling subdomain rebind an admin's session to a different actor, tenant, or authorization mode. AshAdmin's client JavaScript read its state cookies (tenant, actor_resource, actor_primary_key, actor_action, actor_domain, actor_authorizing, actor_paused) by matching the cookie name with an unanchored regular expression (new RegExp(name + "=([^;]+)")) against the whole document.cookie. Any cookie whose name merely ends with the requested name therefore matches, and whichever is serialized first wins. Because cookies are shared across a registrable domain, a compromised sibling subdomain can set a shadowing cookie (for example xactor_authorizing) with Domain=.example.com that flows unvalidated into the admin's LiveSocket connect params. The fix matches cookie names by exact equality. This issue affects ash_admin: from 0.9.1 before 1.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在信任Cookie未进行验证与完整性检查
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework AshAdmin 会话机制问题漏洞
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 0.9.1版本至1.3.1之前版本存在会话机制问题漏洞，该漏洞源于未对Cookie进行验证和完整性检查，使用未锚定正则表达式匹配Cookie名称，可能导致攻击者控制兄弟子域，通过设置影子Cookie将管理员会话重新绑定到不同的actor、租户或授权模式。
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 0.9.1 ~ 1.3.1 cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*
ash-project ash_admin 77a43cc4fa04cb59c38fc434568a35a38ecb995a ~ e93a3408a85035e1f90275d02bc2470c96095e56 cpe:2.3:a:ash-project:ash_admin:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-75757

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III. Intelligence Information for CVE-2026-75757

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Patches & Fixes for CVE-2026-75757 (1)

Vendor Advisories for CVE-2026-75757 (2)

Vendor Pages for CVE-2026-75757 (1)

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-2026-82722 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-2026-81852 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
Same vendor: ash-project
Same weakness: CWE-565

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