CVE-2026-80465: High severity Mendix Mendix SAML (Mendix 10 compatible) vulnerability
A vulnerability has been identified in Mendix SAML (Mendix 10 compatible) (All versions < V4.2.3), Mendix SAML (Mendix 11 compatible) (All versions < V4.2.3), Mendix SAML (Mendix 9.24 compatible) (All versions < V3.6.27). Affected versions of the module do not properly validate the SAML response signature. This could allow unauthenticated remote attackers to hijack an account (session) in specific SSO configurations.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Mendix SAMLto a version that resolves this vulnerability.Fixed in 4.2.3 - Upgrade
Upgrade
Mendix SAMLto a version that resolves this vulnerability.Fixed in 3.6.27
Event History
Frequently Asked Questions
Which deployments are exposed to account session hijacking?
The issue affects specific SSO configurations using vulnerable Mendix SAML module versions. The affected module lines are Mendix 10-compatible and Mendix 11-compatible versions earlier than V4.2.3, and Mendix 9.24-compatible versions earlier than V3.6.27.
Does exploitation require an authenticated account or user interaction?
No. The provided vector identifies exploitation as network-reachable with no privileges or user interaction required, although attack complexity is high. Successful exploitation depends on a specific SSO configuration.
What should be updated to remediate the issue?
Update the Mendix 10-compatible or Mendix 11-compatible Mendix SAML module to V4.2.3 or later. Update the Mendix 9.24-compatible module to V3.6.27 or later.