Cisco Identity Services Engine Vulnerabilities

Multiple vulnerabilities in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow a remote attacker to bypass authentication to the REST API, achieve remote code execution, perform SQL injection, and conduct XML External Entity injection attacks on an affected device.

For more information about these vulnerabilities, see the Details ["#details"] section of this advisory.

Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP"]. In addition, for further documentation of improvements and fixes in Cisco Identity Services Engine, see Cisco Identity Services Engine Security Hardening Release: September 2026 ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-ise-XU5EwX5T"].

CVE-2026-76423 — Cisco ISE ERS API Authentication Bypass Vulnerability (CVSS 3.1 10.0, CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L) CVE-2026-76424 — Cisco ISE Arbitrary File Access Vulnerability (CVSS 3.1 7.2, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) CVE-2026-76425 — Cisco ISE SQL Injection Vulnerability (CVSS 3.1 7.6, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N) CVE-2026-76426 — Cisco ISE SQL Injection Vulnerability (CVSS 3.1 4.9, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N) CVE-2026-76427 — Cisco ISE XML External Entity Injection Vulnerability (CVSS 3.1 4.9, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N) CVE-2026-76428 — Cisco ISE Profiler SQL Injection Vulnerability (CVSS 3.1 4.9, CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N)