CVE-2026-76460 is a critical-severity authentication bypass vulnerability affecting an API endpoint in Cisco ISE and ISE-PIC appliances. The flaw arises because the API does not enforce sufficient authentication controls, allowing remote unauthenticated attackers to send crafted requests that bypass the web-based management interface. Exploitation can lead to root-level command execution, enabling attackers to hide or delete indicators of compromise. Cisco has confirmed active exploitation and released patches for versions 3.5 Patch 4, 3.4 Patch 7, 3.3 Patch 12, 3.2 Patch 11, and 3.1 Patch 12. No workarounds exist besides using infrastructure ACLs to restrict access. Cisco advises reviewing access logs for suspicious activity and re-imaging affected nodes if compromise is suspected. CISA has mandated patching within three days for federal agencies.

Successful exploitation allows remote unauthenticated attackers to bypass authentication controls on Cisco ISE and ISE-PIC devices, gaining unauthorized access to the management interface. Attackers can execute commands with root privileges, potentially hiding or deleting forensic evidence and compromising the integrity and security of the affected systems. This poses a critical risk to network security and device management.

Cisco has released official patches for multiple versions of ISE and ISE-PIC; upgrading to these fixed versions is strongly recommended to remediate the vulnerability. No workarounds exist except restricting network traffic to the affected devices using infrastructure ACLs to prevent remote exploitation. Organizations should monitor access logs for suspicious usernames on all deployment nodes and consider re-imaging affected devices if malicious activity is detected. Follow Cisco's advisory and CISA guidance for timely patching.