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CVE-2026-20309: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Cisco Cisco Identity Services Engine Software

0
Medium
VulnerabilityCVE-2026-20309cvecve-2026-20309
Published: 09/16/2026 (09/16/2026, 20:17:58 UTC)
Source: CVE Database V5
Vendor/Project: Cisco
Product: Cisco Identity Services Engine Software

Description

A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

CVSS v3.1

Score 6.1medium

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected software

Cisco

Cisco Identity Services Engine Software

Affected versions
=3.1.0=3.2.0=3.3.0=3.4.0=3.5.0
GitHub Actionsmore threats →ai
cisco/identity-services-engine
pkg:github/cisco/identity-services-engine
Affected versions
=3.1.0=3.2.0=3.3.0=3.4.0=3.5.0

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 09/16/2026, 21:18:13 UTC

Technical Analysis

This vulnerability in Cisco Identity Services Engine Software's web management interface arises from improper neutralization of input during web page generation, enabling reflected XSS attacks. An unauthenticated attacker can exploit this by persuading a user to click a maliciously crafted link, resulting in arbitrary script execution within the user's browser context. The flaw stems from insufficient input validation in the interface, potentially exposing sensitive information accessible via the browser session.

Potential Impact

Successful exploitation allows an attacker to execute arbitrary script code in the context of the affected interface, potentially accessing sensitive browser-based information. The vulnerability does not require authentication and has a medium severity score (CVSS 6.1). There is no indication of availability impact or known exploits in the wild.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Until a patch is available, users should exercise caution when clicking links related to the Cisco ISE management interface and consider additional protective measures such as web filtering or disabling unnecessary web interface access.

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Technical Details

Data Version
5.2
Assigner Short Name
cisco
Date Reserved
2025-10-08T11:59:15.409Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 6aab006a55bf5e2cf5232016

Added to database: 09/16/2026, 20:47:38 UTC

Last enriched: 09/16/2026, 21:18:13 UTC

Last updated: 09/17/2026, 03:01:24 UTC

Views: 4

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