CVE-2026-41670
CVE-2026-41670 · Admidio: SAML Response Sent to Unvalidated Assertion Consumer Service URL from AuthnRequest
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Admidio is an open-source user management solution. Prior to version 5.0.9, the SAML IdP implementation in Admidio's SSO module uses the AssertionConsumerServiceURL value directly from incoming SAML AuthnRequest messages as the destination for the SAML response, without validating it against the registered ACS URL (smc_acs_url) stored in the database for the corresponding service provider client. An attacker who knows the Entity ID of a registered SP client can craft a SAML AuthnRequest with an arbitrary AssertionConsumerServiceURL, causing the IdP to send the signed SAML response -- containing user identity attributes (login name, email, roles, profile fields) -- to an attacker-controlled URL. This issue has been patched in version 5.0.9.
CVSS 8.2 · High · EPSS 0.3% · Fix available
- Published
- Updated
Stack: php
Affected products and versions
admidio
- Versions
- < 5.0.9: Affected
No fix published
admidio/admidio Packagist
- Versions
- 4.1.0
- 4.1.3
- v4.2-Beta.1
- v4.2-Beta.2
- v4.2-Beta.3
- v4.2.0
- v4.2.1
- v4.2.10
- v4.2.11
- v4.2.12
- v4.2.13
- v4.2.14
- v4.2.2
- v4.2.3
- v4.2.4
- v4.2.5
- v4.2.6
- v4.2.7
- v4.2.8
- v4.2.9
- v4.3-Beta.1
- v4.3-Beta.3
- v4.3-Beta.4
- v4.3-Beta.5
- v4.3.0
- v4.3.1
- v4.3.10
- v4.3.11
- v4.3.12
- v4.3.13
- v4.3.14
- v4.3.15
- v4.3.16
- v4.3.17
- v4.3.2
- v4.3.3
- v4.3.4
- v4.3.5
- v4.3.6
- v4.3.7
- v4.3.8
- v4.3.9
- v5.0-Beta.1
- v5.0-Beta.2
- v5.0-Beta.3
- v5.0.0
- v5.0.1
- v5.0.2
- v5.0.3
- v5.0.4
- v5.0.5
- v5.0.6
- v5.0.7
- v5.0.8
- Affected ranges
- ECOSYSTEM: < 5.0.9
Update to 5.0.9