CVE-2026-20047
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2026-01-15

Last updated on: 2026-01-15

Assigner: Cisco Systems, Inc.

Description
A vulnerability 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 cross-site scripting (XSS) attacks against a user of the interface. This vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of an affected system. An attacker could exploit this vulnerability by injecting malicious code into specific pages of the interface. 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. To exploit this vulnerability, the attacker must have valid administrative credentials.
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Meta Information
Published
2026-01-15
Last Modified
2026-01-15
Generated
2026-06-16
AI Q&A
2026-01-16
EPSS Evaluated
2026-06-15
NVD
CVE-2026-20047
EUVD
EUVD-2026-2741
Affected Vendors & Products
Showing 5 associated CPEs
Vendor Product Version / Range
cisco identity_services_engine to 3.2 (exc)
cisco ise_passive_identity_connector to 3.2 (exc)
cisco identity_services_engine 3.2
cisco identity_services_engine 3.3
cisco identity_services_engine 3.4
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-80 The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.
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Executive Summary

This vulnerability is a medium-severity cross-site scripting (XSS) issue in the web-based management interface of Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). It occurs because the interface does not properly validate user-supplied input, allowing an authenticated remote attacker with valid administrative credentials to inject malicious script code into specific pages. Exploiting this vulnerability lets the attacker execute arbitrary scripts in the context of the interface or access sensitive browser-based information. [1]

Impact Analysis

If exploited, this vulnerability could allow an attacker with administrative credentials to run arbitrary scripts within the web interface, potentially leading to unauthorized access to sensitive information stored in the browser or manipulation of the interface. This could compromise the security and integrity of the management system and expose sensitive data to the attacker. [1]

Detection Guidance

There are no specific detection commands or network/system detection methods provided for this vulnerability. Detection would generally require verifying the version of Cisco Identity Services Engine (ISE) or Cisco ISE Passive Identity Connector (ISE-PIC) in use to see if it is earlier than the fixed releases (3.2 Patch 8, 3.3 Patch 8, 3.4 Patch 4). Since exploitation requires valid administrative credentials and involves injecting malicious scripts into the web interface, monitoring for unusual administrative interface activity or script injections could be helpful, but no explicit commands are provided. [1]

Mitigation Strategies

The immediate mitigation step is to upgrade affected Cisco ISE or ISE-PIC installations to the fixed software versions: 3.2 Patch 8, 3.3 Patch 8, or 3.4 Patch 4. Versions 3.5 and later are not affected. There are no workarounds available. Customers should obtain fixed software through Cisco or authorized partners and ensure compatibility with their hardware and software configurations before upgrading. [1]

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