Cisco Identity Services Engine Software API improper authentication

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Cisco Identity Services Engine Software and ISE Passive Identity Connector. This impacts an unknown function of the component API. Performing a manipulation results in improper authentication. This vulnerability is cataloged as CVE-2026-76460. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco Identity Services Engine Software and ISE Passive Identity Connector (affected version unknown). It has been classified as very critical. This affects an unknown functionality of the component API. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in an API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to bypass authentication. This vulnerability is due to insufficient authentication control on an API endpoint. An attacker could exploit this vulnerability by sending a crafted request to an affected API endpoint. A successful exploit could allow the attacker to gain unauthorized access to the affected device by bypassing the web-based management interface.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is uniquely identified as CVE-2026-76460 since 08/19/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 09/16/2026 with a due date of 09/19/2026:

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BO

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Policy Management Software

Vendor

• Cisco

Name

• Identity Services Engine Software
• ISE Passive Identity Connector

License

• commercial

Website

• Vendor: https://www.cisco.com/

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