CVE-2026-76460: critical vulnerability in Cisco Identity Services Engine Software
Cisco Identity Services Engine Authentication Bypass Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
Patch now. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a working public exploit.
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CTIR Gov · ALERTA 87/2026 · 25 Sep 2026Vulnerabilidade crítica que afeta o Cisco Identity Services Engineread on gov.br ↗
- CISC Gov.br · 24 Sep 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
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 BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Cisco Identity Services Engine has a critical flaw that allows anyone on the internet to bypass login and gain full access to the system without credentials. This is a severe security issue because ISE is often used to control network access and security policies.
An unauthenticated remote attacker can exploit insufficient authentication controls on a Cisco ISE API endpoint by sending a crafted request to bypass the authentication mechanism and gain unauthorized access to the device's management interface. The vulnerability requires network connectivity to the affected API endpoint and can result in complete compromise of the ISE system and its security policies.
In the same product, most dangerous first.