21.10.2025
Sunsetting the clientAuth EKU from Certum SSL/TLS certificates
From October 2025, the SSL/TLS certificate industry is undergoing a significant change – public SSL/TLS certificates will no longer include the Extended Key Usage (EKU) TLS Web Client Authentication (clientAuth) extension. This certificate extension allowed a single SSL/TLS certificate to be used for both server and client authentication in mutual TLS (mTLS) scenarios.
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