CVE-2026-76423: Cisco Identity Services Engine Software

Critical severity, CVSS 10.0. EPSS: 0.6% chance of exploitation in the next 30 days.

A vulnerability in the REST API of Cisco ISE and Cisco ISE-PIC could allow an unauthenticated, remote attacker to gain administrative access to an affected device. This vulnerability is due to the REST API web service being exposed with insufficient authorization checks. An attacker could exploit this vulnerability by sending a crafted HTTP request to the exposed REST API port. A successful exploit could allow the attacker to read and modify ISE configuration and identity data with administrative privileges.

Affected products

• Cisco Cisco Identity Services Engine Software: version 3.1.0 only; version 3.1.0 p1 only; version 3.1.0 p3 only; version 3.1.0 p2 only; version 3.2.0 only; version 3.1.0 p4 only; …
• Cisco Cisco Ise Passive Identity Connector: version 3.2.0 only; version 3.1.0 only; version 3.3.0 only; version 3.4.0 only; version 3.5.0 only

Published 2026-09-16. Last modified 2026-09-17.