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CVE-2026-82726— AshPhoenix get_subdomain maps a crafted or differently-cased Host header to an arbitrary tenant

Quick assessment

Affected
ash-project ash_phoenix
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 ash phoenix是Ash Framework组织的一个声明式应用开发框架。 Ash Framework ash phoenix 2.1.26版本至2.3.25之前版本存在输入验证错误漏洞，该漏洞源于正则表达式过于宽松，root_host未正确转义且替换未锚定，可能导致远程攻击者通过特制的Host头选择Ash应用程序的租户或降级请求。

CVSS 6.3 · Medium EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1010 · Application Window Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_phoenix 2.1.26< 2.3.25 affected
9a5ea4d377bc263de321d79574872a3dfc4fb541< 8306f29e77526840c89f3cd244996ce7c0fa2cda affected
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I. Basic Information for CVE-2026-82726

Vulnerability Information
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Vulnerability Title
AshPhoenix get_subdomain maps a crafted or differently-cased Host header to an arbitrary tenant
Source: CVE Program / CVE List V5
Vulnerability Description
Permissive Regular Expression vulnerability in ash-project ash_phoenix lets a remote client select the tenant an Ash application uses, or degrade the request, by sending a crafted Host header. AshPhoenix.Helpers.get_subdomain/2 stripped the root domain with String.replace(host, ~r/.?#{root_host}/, ""). The root host was interpolated raw, so each . became a wildcard and any metacharacter a pattern, and the replace was global and unanchored, so a match was removed from anywhere in the string. With root_host example.com, Host: foo.exampleXcom.attacker.net returned the tenant foo.attacker.net. A metacharacter-bearing or nil root host degraded the pattern or raised on every request. The comparison was also case-sensitive, so TENANT.EXAMPLE.COM and EXAMPLE.COM slipped past the root-host allowlist. conn.host comes from the client Host header. The fix matches the root host case-insensitively and only as an exact trailing suffix. This issue affects ash_phoenix: from 2.1.26 before 2.3.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
宽松定义的正则表达式
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework ash phoenix 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework ash phoenix是Ash Framework组织的一个声明式应用开发框架。 Ash Framework ash phoenix 2.1.26版本至2.3.25之前版本存在输入验证错误漏洞，该漏洞源于正则表达式过于宽松，root_host未正确转义且替换未锚定，可能导致远程攻击者通过特制的Host头选择Ash应用程序的租户或降级请求。
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_phoenix 2.1.26 ~ 2.3.25 cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
ash-project ash_phoenix 9a5ea4d377bc263de321d79574872a3dfc4fb541 ~ 8306f29e77526840c89f3cd244996ce7c0fa2cda cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82726

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III. Intelligence Information for CVE-2026-82726

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Other References for CVE-2026-82726 (3)

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-2026-82579 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_phoenix
Same vendor: ash-project
Same weakness: CWE-625

V. Comments for CVE-2026-82726

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