CVE-2026-41669 Details
Description
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.
A vulnerability exists in the SAML Identity Provider implementation of Admidio, an open-source user management solution, prior to version 5.0.9. The issue arises because the implementation ignores the return value of the 'validateSignature()' method in two critical functions, 'handleSSORequest()' and 'handleSLORequest()'. This oversight allows unsigned or improperly signed SAML AuthnRequests and LogoutRequests to be processed as if they were correctly signed, rendering the 'smc_require_auth_signed' configuration option ineffective. As a result, forged requests can be exploited without detection.
Users are advised to update to Admidio version 5.0.9 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 7, 2026CISA-ADP
Assessed May 7, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Admidio/admidio/security/advisories/GHSA-25cw-98hg-g3cg | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/Admidio/admidio/releases/tag/v5.0.9 | [email protected] | Release NotesVendor |
| https://github.com/Admidio/admidio/security/advisories/GHSA-25cw-98hg-g3cg | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Admidio | <= 5.0.8 (semver) |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 7, 2026 | CVE Modified | CISA-ADP |
| May 7, 2026 | New CVE Received | [email protected] |