Is CVE-2026-41670 actively exploited?

No active exploitation of CVE-2026-41670 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-41670 be exploited remotely?

Yes. CVE-2026-41670 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-41670?

CVE-2026-41670 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-41670

HIGH

CVE-2026-41670

CWE-20Published: May 7, 2026· Updated: May 7, 2026

8.2

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.5th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-41670 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.2.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.