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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-project 中的 ash_admin 存在“依赖未经校验且无完整性检查的 Cookie”漏洞。该漏洞允许控制同级子域名的攻击者将管理员的会话重新绑定到不同的操作者、租户或授权模式。 AshAdmin 的客户端 JavaScript 通过在整个 document.cookie 上使用未锚定的正则表达式（new RegExp(name + "=([^;]+)")来读取其状态 Cookie（tenant、actor_resource、actor_primary_key、actor_action、actor_d

CVSS 8.3 · High

Possible ATT&CK Techniques 2 AI

T1078 · Valid Accounts T1146
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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

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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Other References for CVE-2026-75757 (4)

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-2026-81315 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-2026-81853 2.3 LOW AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attrib
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

V. Comments for CVE-2026-75757

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