PT-2026-21950 · Cisco · Cisco Fxos+1

Published 2026-02-25 · Updated 2026-02-26 · CVE-2026-20091

Positive Technologies (AI Summary)

CVSS v3.1

4.8

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco FXOS Software (affected versions not specified) Cisco UCS Manager Software (affected versions not specified)

Description A flaw exists in the web-based management interface of Cisco FXOS Software and Cisco UCS Manager Software that could permit an authenticated, remote attacker to perform a stored cross-site scripting (XSS) attack against a user. This issue stems from inadequate validation of user-supplied input within the web interface. An attacker could inject malicious data into specific pages of the interface. A successful exploit might enable the attacker to execute arbitrary script code within the affected interface or gain access to sensitive, browser-based information. The attacker must possess valid credentials for a user account with either Administrator or AAA Administrator privileges to exploit this issue.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-20091

Affected Products

Cisco Fxos

Cisco Ucs Manager

References · 3

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsfxosxss-7skVE8Zv · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-20091 · Security Note
• https://twitter.com/CVEnew/status/2027099322161279335 · Twitter Post