Duo Certificate Authority (CA) bundle update: Important changes coming February 2026
As technology evolves, so do the security foundations that underpin the systems we rely on every day. One such foundational change is coming soon from Cisco Duo, the widely‑used multi‑factor authentication (MFA) platform that many organisations deploy to secure access to critical systems. Although this change isn’t a vulnerability in the traditional sense, it could impact the availability of Duo authentication services for outdated software and integrations.