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Critical · 9.1 CVE-2026-20306 EUVD-2026-80884GHSA-m8gm-7wx7-cf56

Cisco Identity Services Engine Command Injection Vulnerability

Published Sep 16, 2026 · Updated Sep 17, 2026 · Assigned by cisco

Description

A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.

This vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.

Affected products

VendorProductAffectedFixed
Cisco Cisco Identity Services Engine Software 3.4 Patch 4, 3.4 Patch 5, 3.5 Patch 3, 3.4 Patch 6 —
Cisco Cisco ISE Passive Identity Connector 3.4.0 —

Advisories 2

References