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CVE-2026-117554— Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php

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 5.0.17 之前的版本存在访问控制不当的漏洞，允许已认证成员在系统禁止嘉宾注册的情况下，通过提交 字段来注册活动嘉宾。攻击者可在 中将 的值设置为剩余座位数，从而耗尽活动容量，阻止其他成员进行注册。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 2 AI

T1562 T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
admidio admidio < 5.0.17 affected
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I. Basic Information for CVE-2026-117554

Vulnerability Information
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Vulnerability Title
Admidio before 5.0.17 Event Guest Restriction Bypass via events_function.php
Source: CVE Program / CVE List V5
Vulnerability Description
Admidio before 5.0.17 contains an improper access control vulnerability that allows authenticated members to register event guests by submitting the additional_guests field when guests are disallowed. Attackers can set additional_guests to the remaining seat count in modules/events/events_function.php to exhaust event capacity and block other members from registering.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端安全的客户端实施
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
admidio admidio 0 ~ 5.0.17 -

II. Public POCs for CVE-2026-117554

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-117554

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Patches & Fixes for CVE-2026-117554 (1)

Vendor Advisories for CVE-2026-117554 (2)

Vendor Pages for CVE-2026-117554 (3)

Other References for CVE-2026-117554 (1)

IV. Related Vulnerabilities

Same product: admidio
Same vendor: admidio
Same weakness: CWE-602