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CVE-2026-41671— Admidio: OIDC Token Introspection Endpoint Returns Active for All Tokens Without Validation

Quick assessment

Affected
Admidio admidio
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.

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之前版本存在授权问题漏洞，该漏洞源于OIDC令牌内省端点始终返回active为true，不验证令牌有效性，且令牌撤销端点返回revoked为true但不实际撤销令牌，可能导致完全的身份验证绕过。

CVSS 6.8 · Medium EPSS 0.43% · P34

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Admidio admidio < 5.0.9 affected
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I. Basic Information for CVE-2026-41671

Vulnerability Information
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Vulnerability Title
Admidio: OIDC Token Introspection Endpoint Returns Active for All Tokens Without Validation
Source: CVE Program / CVE List V5
Vulnerability Description
Admidio is an open-source user management solution. Prior to version 5.0.9, the OIDC token introspection endpoint (/modules/sso/index.php/oidc/introspect) always returns {"active": true} for every request, regardless of whether a valid token is provided, whether the token is expired, revoked, or completely fabricated. The endpoint performs no authentication of the calling resource server and no validation of the submitted token. Any resource server that relies on this introspection endpoint to validate access tokens will accept all requests as authorized, enabling complete authentication bypass. Additionally, the OIDC token revocation endpoint (/oidc/revoke) returns {"revoked": true} without actually revoking any token, preventing resource servers from invalidating compromised credentials. This issue has been patched in version 5.0.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Admidio 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于OIDC令牌内省端点始终返回active为true，不验证令牌有效性，且令牌撤销端点返回revoked为true但不实际撤销令牌，可能导致完全的身份验证绕过。
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
Admidio admidio < 5.0.9 -

II. Public POCs for CVE-2026-41671

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III. Intelligence Information for CVE-2026-41671

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Vendor Advisories for CVE-2026-41671 (1)

Vendor Pages for CVE-2026-41671 (1)

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-2026-41670 8.2 HIGH Admidio: SAML Response Sent to Unvalidated Assertion Consumer Service URL from AuthnReques
CVE-2026-41660 7.1 HIGH Admidio: Inverted 2FA Reset Authorization Check Lets Group Leaders Strip Admin TOTP
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
Same vendor: Admidio
Same weakness: CWE-287

V. Comments for CVE-2026-41671

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