Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

CVE-2026-20127 is a critical authentication bypass vulnerability affecting Cisco Catalyst SD-WAN Controller (vSmart) and Cisco Catalyst SD-WAN Manager (vManage). The flaw stems from improper validation within the control plane and management plane authentication mechanisms, allowing a remote, unauthenticated attacker to submit crafted requests that bypass standard authentication controls. Successful exploitation results in access to the system as a high-privileged internal user account.

On February 25, 2026, Cisco released fixes for a maximum severity authentication bypass vulnerability in Cisco Catalyst SD-WAN Controller (formerly vSmart) and Cisco Catalyst SD-WAN Manager (formerly vManage), tracked as CVE-2026-20127. The flaw arises from a broken peering authentication mechanism in the control-plane authentication workflow. This vulnerability potentially allows a remote, unauthenticated threat actor to bypass authentication and obtain administrative privileges on an affected system.

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During a recent video interview, we spent time unpacking a deceptively simple question: what actually makes a vulnerability critical? Severity scores, exploitability, and asset importance all factor into the answer. But one layer of context consistently changes the urgency of a finding more than most teams expect: internet exposure. The difference between a vulnerability that exists and one that matters often comes down to whether an attacker can reach it.

We are witnessing the birth of a new profession in the blend of security engineering and security operations, a discipline that didn't exist five years ago because the systems it protects didn't exist five years ago. As artificial intelligence moves from experimental to essential and agentic systems begin to perceive, reason, act, and learn autonomously, we need defenders who can operate at the same velocity. I'm talking about the AI Security Engineer.

The Notepad++ incident is a reminder that the tools we use to build our businesses can also be used to break them.

OAuth is a commonly used authorisation framework, that allows websites and web applications to request limited access to a user’s account on another application. Users can grant this limited access to their account, without ever needing to expose their password with the requesting website or application. This is commonly seen with sites that allow you to log in with popular accounts such as a social media login, Microsoft or Google account.