CVE-2026-41669
HighSummary
Admidio is an open-source user management solution. In versions prior to 5.0.9, the SAML Identity Provider implementation discards the return value of its validateSignature() method, leading to the processing of unsigned or invalidly-signed SAML requests identically to properly signed ones.
Risk Assessment
The lack of effective SAML signature verification may lead to unauthorized access to resources, posing a serious security threat to the organization.
Recommendation
It is recommended to upgrade to version 5.0.9 or later to fix this vulnerability and ensure proper SAML signature verification.
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Original NVD description (English source)
Admidio is an open-source user management solution. Prior to version 5.0.9, the Admidio SAML Identity Provider implementation discards the return value of its validateSignature() method at both call sites (handleSSORequest() line 418 and handleSLORequest() line 613). The method returns error strings on failure rather than throwing exceptions, but the developer believed it would throw (per comments on lines 416 and 611). This means the smc_require_auth_signed configuration option is completely ineffective — unsigned or invalidly-signed SAML AuthnRequests and LogoutRequests are processed identically to properly signed ones. This issue has been patched in version 5.0.9.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS