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CVE-2026-41657

Admidio: Cross-Organization Member Data Exposure via Permission Check Mismatch in contacts_data.php

Published: May 7, 2026Updated: May 7, 2026 Sources: CVE List NVDCWE-863
NVD MITRE
4.9CVSSMEDIUM
EPSS Score
0.3%
Top 76.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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 Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-863

Affected Products

admidioAdmidio
On-prem
Enterprise Software / collaboration-groupware
admidiooss-projectEnterprise Softwareaka admidio/admidio

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

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

Timeline

Published
May 7, 2026
Last Updated
May 7, 2026

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