Cross-site scripting in Cisco Identity Services Engine (ISE) - CVE-2026-20309
Published: September 17, 2026
Vulnerability identifier: #VU150724
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-20309
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
The vulnerability exists due to improper input validation in the web-based management interface of Cisco Identity Services Engine when processing user-supplied input. A remote attacker can persuade a user of the interface to click a crafted link to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
User interaction is required to click the crafted link.
Affected software
Cisco Identity Services Engine (ISE)
How to mitigate CVE-2026-20309
Install security update from vendor's website.
Cisco Identity Services Engine (ISE) - addressed in versions 3.3 Patch 12, 3.4 Patch 7, 3.5 Patch 4