CVE-2026-41670— Admidio: SAML Response Sent to Unvalidated Assertion Consumer Service URL from AuthnRequest
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I. Basic Information for CVE-2026-41670
Vulnerability Information
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Vulnerability Title
Admidio: SAML Response Sent to Unvalidated Assertion Consumer Service URL from AuthnRequest
Source: NVD (National Vulnerability Database)
Vulnerability Description
Admidio is an open-source user management solution. Prior to version 5.0.9, the SAML IdP implementation in Admidio's SSO module uses the AssertionConsumerServiceURL value directly from incoming SAML AuthnRequest messages as the destination for the SAML response, without validating it against the registered ACS URL (smc_acs_url) stored in the database for the corresponding service provider client. An attacker who knows the Entity ID of a registered SP client can craft a SAML AuthnRequest with an arbitrary AssertionConsumerServiceURL, causing the IdP to send the signed SAML response -- containing user identity attributes (login name, email, roles, profile fields) -- to an attacker-controlled URL. This issue has been patched in version 5.0.9.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Admidio 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Admidio是Admidio团队的一套开源的成员管理系统。该系统支持成员列表、事件管理、留言簿、相册和下载等功能。 Admidio 5.0.9之前版本存在输入验证错误漏洞，该漏洞源于SAML IdP实现未验证AssertionConsumerServiceURL是否与注册的ACS URL匹配，允许攻击者将包含用户身份属性的SAML响应发送到攻击者控制的URL。
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
II. Public POCs for CVE-2026-41670
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9564 chars
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III. Intelligence Information for CVE-2026-41670
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- Release 5.0.9 · Admidio/admidio · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-41670
Same Patch Batch · Admidio · 2026-05-07 · 13 CVEs total
| CVE-2026-41669 | 8.2 HIGH | Admidio: SAML Signature Validation Result Ignored — Forged AuthnRequests and LogoutRequest |
| CVE-2026-41660 | 7.1 HIGH | Admidio: Inverted 2FA Reset Authorization Check Lets Group Leaders Strip Admin TOTP |
| CVE-2026-41671 | 6.8 MEDIUM | Admidio: OIDC Token Introspection Endpoint Returns Active for All Tokens Without Validatio |
| CVE-2026-42194 | 6.8 MEDIUM | Incomplete fix for CVE-2026-32812: SSRF in admidio |
| CVE-2026-41658 | 6.5 MEDIUM | Admidio: Missing Authorization on Inventory Module Destructive Endpoints Allows Any Authen |
| CVE-2026-41655 | 6.5 MEDIUM | Admidio: Path Traversal in ECard Preview Allows Reading Arbitrary Server Files Including D |
| CVE-2026-41661 | 6.1 MEDIUM | Admidio: Reflected XSS in msg_window.php via Square Bracket to HTML Tag Conversion |
| CVE-2026-41662 | 5.2 MEDIUM | Admidio: Missing Minimum Administrator Check in Role Membership Removal |
| CVE-2026-41657 | 4.9 MEDIUM | Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts |
| CVE-2026-41656 | 4.5 MEDIUM | Admidio: Path Traversal via Unvalidated `name` Parameter in Document Add Mode Enables Arbi |
| CVE-2026-41663 | 3.5 LOW | Admidio: CSRF on Admin Preferences Triggers Unauthorized Backup, .htaccess Write, and Emai |
| CVE-2026-41659 | 2.7 LOW | Admidio: Hidden Profile Field Values Leaked via Blind Search Oracle in Member Assignment |
IV. Related Vulnerabilities
Same product: admidio
- CVE-2026-42194
Incomplete fix for CVE-2026-32812: SSRF in admidio - CVE-2026-41671
Admidio: OIDC Token Introspection Endpoint Returns Active fo - CVE-2026-41669
Admidio: SAML Signature Validation Result Ignored — Forged A - CVE-2026-41663
Admidio: CSRF on Admin Preferences Triggers Unauthorized Bac - CVE-2026-41662
Admidio: Missing Minimum Administrator Check in Role Members
Same vendor: Admidio
- CVE-2026-42194
Incomplete fix for CVE-2026-32812: SSRF in admidio - CVE-2026-41671
Admidio: OIDC Token Introspection Endpoint Returns Active fo - CVE-2026-41669
Admidio: SAML Signature Validation Result Ignored — Forged A - CVE-2026-41663
Admidio: CSRF on Admin Preferences Triggers Unauthorized Bac - CVE-2026-41662
Admidio: Missing Minimum Administrator Check in Role Members
Same weakness: CWE-20
V. Comments for CVE-2026-41670
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