Mendix SAML Response Signature Validation Bypass

CVE-2026-80465 represents a critical authentication bypass vulnerability in Mendix SAML modules across versions 9.24, 10, and 11. The flaw stems from improper validation of SAML response signatures (CWE-347), allowing unauthenticated attackers to forge or manipulate SAML assertions and hijack user sessions in SSO-enabled environments. This is particularly dangerous because SAML is foundational to enterprise single sign-on infrastructure—organizations relying on affected Mendix versions for identity federation face direct account takeover risk without proper signature verification acting as a cryptographic gatekeeper.

While no specific MITRE ATT&CK techniques are mapped to this CVE, Casky's Claude-powered analysis would detect attack patterns associated with Initial Access and Credential Access phases. Practitioners using Casky would observe findings related to malicious SAML assertion injection, forged authentication tokens, and lateral movement indicators following successful session hijacking. The platform's extended reasoning capability would correlate suspicious authentication flows—such as valid-looking SAML responses lacking cryptographic integrity—against the 754 security skills in its knowledge base, surfacing configuration weaknesses in SAML signature validation logic, unsafe XML processing, and identity provider trust boundaries. Security teams would receive actionable alerts on authentication anomalies before attackers achieve persistent access.