CVE-2026-20091

MediumCVSS 4.8/10Last modified Jun 17, 2026

Description

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. 

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

Affected software

VendorProductVersions
CiscoCisco Firepower Extensible Operating System (FXOS)2.14.1.131; 2.14.1.143; 2.14.1.163; 2.14.1.167; 2.16.0.128
CiscoCisco Secure Firewall Adaptive Security Appliance (ASA) Software9.12.2; 9.12.1; 9.12.3; 9.12.4; 9.12.3.2; 9.12.3.12; 9.12.2.5; 9.12.1.2; 9.12.2.1; 9.12.3.7; 9.12.2.9; 9.12.3.9; 9.12.1.3; 9.12.4.2; 9.12.4.4; 9.12.4.7; 9.12.4.8; 9.12.4.10; 9.12.4.13; 9.12.4.18
CiscoCisco Unified Computing System (Managed)4.0(4h); 4.1(1a); 4.0(1c); 4.0(4a); 4.0(1a); 4.0(1d); 4.1(1c); 4.0(2a); 4.0(4g); 4.0(2e); 4.0(4c); 4.0(4f); 4.0(1b); 4.0(2b); 4.0(2d); 4.1(1b); 4.0(4d); 4.0(4e); 4.0(4b); 4.1(2a)

References

Timeline

Published
Feb 25, 2026
Last modified
Jun 17, 2026
NVD status
Deferred

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CVE-2026-20091: Medium severity, CVSS 4.8 | Vulnix