Emergency security updates have been distributed by enterprise networking maintainers to resolve a maximum severity zero-day vulnerability in central network access control nodes. Threat actors actively exploit missing authentication controls on API endpoints to gain full administrative authority over network policy engines.
The vulnerability, tracked as CVE-2026-76460 with a CVSS score of 10.0, affects Cisco Identity Services Engine software installations. The flaw stems from insufficient access control validation handling privileged API calls. Unauthenticated remote adversaries transmit crafted HTTP requests to exposed API endpoints, bypassing authentication checks to execute administrative actions, extract network access logs, and modify policy rules. CISA added the flaw to the Known Exploited Vulnerabilities catalog under Binding Operational Directive 26-04 with a mandatory compliance deadline.
Subverting central network access control nodes destroys network segmentation and zero trust isolation models. Because Cisco ISE governs network authentication, dynamic VLAN assignments, and endpoint posture checks across corporate networks, an unauthenticated administrative compromise permits threat actors to grant untrusted devices full network access and move laterally across enterprise subnets.
– Force immediate installation of official security updates published by Cisco across all Identity Services Engine deployment nodes.
– Restrict public internet routing to Cisco ISE administrative and API interfaces using isolated management VLANs.
– Inspect ISE API gateway logs for unverified HTTP requests targeting privileged administrative API endpoints.
– Audit network access control policies and active user session registries for unauthorized policy modifications.
Network access control defense demands strict API gateway authorization and rapid patch execution to ensure central identity gateways remain protected from unauthenticated access bypass. #CodeDefence #Cisco #ISE #ZeroDay #AuthBypass #CISA #KEV #NetworkSecurity #AppSec
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