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CVE-2026-41662— Admidio: Missing Minimum Administrator Check in Role Membership Removal

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之前版本存在代码问题漏洞，该漏洞源于Role::stopMembership未验证移除管理员角色后是否剩余管理员，允许任何管理员移除最后一名其他管理员，导致整个系统无法进行管理访问。

CVSS 5.2 · Medium EPSS 0.29% · P21

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Admidio admidio < 5.0.9 affected
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I. Basic Information for CVE-2026-41662

Vulnerability Information
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Vulnerability Title
Admidio: Missing Minimum Administrator Check in Role Membership Removal
Source: CVE Program / CVE List V5
Vulnerability Description
Admidio is an open-source user management solution. Prior to version 5.0.9, Role::stopMembership() does not verify whether removing a user from the administrator role leaves zero administrators. The deprecated Membership::stopMembership() contains this safety check, but the current code path bypasses it. Any administrator can remove the last remaining other administrator, locking the entire system out of administrative access. The exploit does not require concurrent requests; sequential removals produce the same result. This issue has been patched in version 5.0.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Admidio 代码问题漏洞
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之前版本存在代码问题漏洞，该漏洞源于Role::stopMembership未验证移除管理员角色后是否剩余管理员，允许任何管理员移除最后一名其他管理员，导致整个系统无法进行管理访问。
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-2026-41662

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III. Intelligence Information for CVE-2026-41662

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Vendor Advisories for CVE-2026-41662 (1)

Vendor Pages for CVE-2026-41662 (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-2026-41671 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-2026-41657 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-754

V. Comments for CVE-2026-41662

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