CVE-2026-41670
HighSummary
Admidio is an open-source user management solution. Prior to version 5.0.9, the SAML IdP implementation in Admidio's SSO module did not validate the AssertionConsumerServiceURL value from incoming SAML AuthnRequest messages, allowing an attacker to send the SAML response to a controlled URL.
Risk Assessment
An attacker could gain access to sensitive user information such as login name, email, and roles, posing a serious security threat to the organization.
Recommendation
It is recommended to upgrade to version 5.0.9 or later to secure the system against this type of attack.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS