---
cve: "CVE-2026-41657"
severity: "MEDIUM"
cvss: 4.9
epss: "32%"
vendor: "Admidio"
kev: false
exploited: false
published: "2026-05-07 04:16:28"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T02:50:53+02:00"
---

# CVE-2026-41657

> 4.9 MEDIUM · 🧪 PoC

## Beschreibung

Admidio is an open-source user management solution. Prior to version 5.0.9, the contacts_data.php endpoint uses a weaker permission check (isAdministratorUsers(), requiring only rol_edit_user=true) than the frontend UI (contacts.php) which correctly requires the stronger isAdministrator() (requiring rol_administrator=true) and the contacts_show_all system setting. A user manager who is not a full administrator can directly request contacts_data.php?mem_show_filter=3 to retrieve all user records across all organizations in the Admidio instance, bypassing multi-tenant organization isolation. This issue has been patched in version 5.0.9.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- d39915697e6e0be04d02d55a46c631f53013aea6 (Commit)

## Referenzen

- <https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr>
- <https://github.com/Admidio/admidio/releases/tag/v5.0.9>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-41657) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_