CVE-2026-20091 MEDIUM

CVE-2026-20091: Cisco UCS Manager and FXOS Software Stored Cross-Site Scripting Vulnerability

Vendor Cisco
Product Cisco Firepower Extensible Operating System (FXOS)
Weakness CWE-79 · XSS
Published February 25, 2026
Last update February 25, 2026

CVSS base score

4.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

A vulnerability in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack 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 data 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 credentials for a user account with the role of Administrator or AAA Administrator. 

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 25, 2026 Record updated