Vulnerability in Cisco Identity Services Engine Software

CVE-2026-76423

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.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-76423?
CVE-2026-76423 is a critical-severity vulnerability in Cisco Identity Services Engine Software, classified under Authentication Bypass by Spoofing. CVSS score: 10.0/10. Published 2026-09-16.
How severe is CVE-2026-76423?
Critical severity. CVSS v3 base score is 10.0 out of 10.