CVE-2025-20289: 
Cisco ISE vulnerability analysis and mitigation

Multiple vulnerabilities in the web-based management interface of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an authenticated, remote attacker to conduct a reflected cross-site scripting (XSS) attack against a user of the interface. The vulnerability (CVE-2025-20289) was disclosed on November 5, 2025, and affects Cisco ISE and ISE-PIC systems regardless of their configuration (Cisco Advisory).

The vulnerability stems from insufficient validation of user-supplied input by the web-based management interface of affected systems. The vulnerability has been assigned a CVSS base score of 4.8 (Medium) with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. The attack requires network access, has low attack complexity, requires high privileges, and user interaction for successful exploitation (Cisco Advisory).

A successful exploit could allow an attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information. The vulnerability affects both confidentiality and integrity at a low level, while availability remains unaffected (Cisco Advisory).

Cisco has released software updates that address this vulnerability. For version 3.2, the fix is available in Patch 8 (Dec 2025), for version 3.3 in Patch 8 (Nov 2025), and for version 3.4 in Patch 2. Version 3.5 is not vulnerable to this issue. There are no workarounds available that address this vulnerability (Cisco Advisory).