CVE-2026-76423
Cisco ISE API Authentication Bypass Vulnerability
Description
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.
Weakness: CWE-290
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco ISE Passive Identity Connector | Identity / IAM / MFA | cna-assigner |
| Cisco | Cisco Identity Services Engine (ISE) Check your version | Identity / IAM / MFA | cna-assigner |
Vendor-reported products (2)
- Cisco · Cisco Identity Services Engine Software
- Cisco · Cisco ISE Passive Identity Connector
Vendor advisory
Cisco Identity Services Engine Vulnerabilities
Cisco’s rating: Critical (advisory CVSS 10.0) · Published Sep 16, 2026
Bug IDs: CSCwu20156 , CSCwu26054 , CSCwu26055 , CSCwu27428 , CSCwu39998 , CSCwu43502
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from