Cisco recently disclosed a critical authentication bypass vulnerability (CVE-2026-76423) in its Identity Services Engine REST API, granting unauthenticated attackers administrative access. This poses a significant risk to organizations using ISE as it allows control over network admission policies and potential pivoting to other systems; the flaw doesn't involve credential compromise but relies on exposed management interfaces. Security teams should prioritize restricting access to these interfaces and applying available patches while actively hunting for signs of unauthorized privileged API activity, particularly given that nearly 900,000 deployments exist.
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