CVE-2026-76423: Authentication Bypass by Spoofing in Cisco Cisco Identity Services Engine Software
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.
AI Analysis
Technical Summary
This vulnerability exists due to insufficient authorization checks in the REST API web service of Cisco ISE and Cisco ISE-PIC. An attacker can exploit this by sending a specially crafted HTTP request to the REST API port, bypassing authentication and gaining administrative access. This grants the attacker the ability to read and modify sensitive configuration and identity data on the affected device.
Potential Impact
Successful exploitation results in full administrative access to the Cisco ISE device, allowing an attacker to read and alter configuration and identity data. This compromises confidentiality, integrity, and availability of the system, with a CVSS v3.1 base score of 10.0 indicating critical severity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the REST API port to trusted networks only and monitor for suspicious HTTP requests targeting the API.
CVE-2026-76423: Authentication Bypass by Spoofing in Cisco Cisco Identity Services Engine Software
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.
CVSS v3.1
Score 10.0critical
Affected software
Cisco
Cisco Identity Services Engine Software
Cisco
Cisco ISE Passive Identity Connector
pkg:github/cisco/identity-services-engineRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability exists due to insufficient authorization checks in the REST API web service of Cisco ISE and Cisco ISE-PIC. An attacker can exploit this by sending a specially crafted HTTP request to the REST API port, bypassing authentication and gaining administrative access. This grants the attacker the ability to read and modify sensitive configuration and identity data on the affected device.
Potential Impact
Successful exploitation results in full administrative access to the Cisco ISE device, allowing an attacker to read and alter configuration and identity data. This compromises confidentiality, integrity, and availability of the system, with a CVSS v3.1 base score of 10.0 indicating critical severity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the REST API port to trusted networks only and monitor for suspicious HTTP requests targeting the API.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- cisco
- Date Reserved
- 2026-08-19T12:02:03.633Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaaf94455bf5e2cf51ba046
Added to database: 09/16/2026, 20:17:08 UTC
Last enriched: 09/16/2026, 20:31:45 UTC
Last updated: 09/17/2026, 05:01:22 UTC
Views: 7
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