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CVE-2026-30927— Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter

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 5.0.6之前版本存在安全漏洞，该漏洞源于modules/events/events_function.php中事件参与逻辑存在缺陷，可能导致用户注册其他用户参与活动。

AI Predicted 9.8 Difficulty: Easy EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

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I. Basic Information for CVE-2026-30927

Vulnerability Information
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Vulnerability Title
Admidio: Event participation IDOR - non-leaders can register other users for events via user_uuid parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Admidio is an open-source user management solution. Prior to 5.0.6, in modules/events/events_function.php, the event participation logic allows any user who can participate in an event to register OTHER users by manipulating the user_uuid GET parameter. The condition uses || (OR), meaning if possibleToParticipate() returns true (event is open for participation), ANY user - not just leaders - can specify a different user_uuid and register/cancel participation for that user. The code then operates on $user->getValue('usr_id') (the target user from user_uuid) rather than the current user. This vulnerability is fixed in 5.0.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Admidio 安全漏洞
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 5.0.6之前版本存在安全漏洞，该漏洞源于modules/events/events_function.php中事件参与逻辑存在缺陷，可能导致用户注册其他用户参与活动。
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 < 5.0.6 -

II. Public POCs for CVE-2026-30927

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III. Intelligence Information for CVE-2026-30927

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Patches & Fixes for CVE-2026-30927 (1)

Vendor Advisories for CVE-2026-30927 (1)

News Coverage for CVE-2026-30927 (1)

IV. Related Vulnerabilities

Same product: admidio
Same vendor: Admidio
Same weakness: CWE-639

V. Comments for CVE-2026-30927

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