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

Quick assessment

Affected
Cisco Cisco Firepower Extensible Operating System (FXOS)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco FXOS Software和Cisco UCS Manager Software都是美国思科（Cisco）公司的产品。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。Cisco UCS Manager Software是一款设备管理软件。 Cisco FXOS Software和Cisco UCS Manager Software存在跨站脚本漏洞，该漏洞源于基于Web的管理界面输入验证不足，可能导致存储型跨站脚本攻击。

CVSS 4.8 · Medium EPSS 0.18% · P6

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-20091

Vulnerability Information
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Vulnerability Title
Cisco UCS Manager and FXOS Software Stored Cross-Site Scripting Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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. 
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco FXOS Software和Cisco UCS Manager Software 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco FXOS Software和Cisco UCS Manager Software都是美国思科（Cisco）公司的产品。Cisco FXOS Software是一套运行在思科安全设备中的防火墙软件。Cisco UCS Manager Software是一款设备管理软件。 Cisco FXOS Software和Cisco UCS Manager Software存在跨站脚本漏洞，该漏洞源于基于Web的管理界面输入验证不足，可能导致存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco Firepower Extensible Operating System (FXOS) 2.14.1.131 -
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2 -
Cisco Cisco Unified Computing System (Managed) 4.0(4h) -

II. Public POCs for CVE-2026-20091

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III. Intelligence Information for CVE-2026-20091

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Vendor Advisories for CVE-2026-20091 (1)

Same Patch Batch · Cisco · 2026-02-25 · 15 CVEs total

CVE-2026-20127 10.0 CRITICAL Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
CVE-2026-20129 9.8 CRITICAL Cisco Catayst SD-WAN Authentication Bypass Vulnerability
CVE-2026-20126 8.8 HIGH Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability
CVE-2026-20048 7.7 HIGH Cisco NX-OS Software SNMP Denial of Service Vulnerability
CVE-2026-20128 7.5 HIGH Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability
CVE-2026-20033 7.4 HIGH Cisco NX-OS Software Denial of Service Vulnerability
CVE-2026-20010 7.4 HIGH Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service
CVE-2026-20051 7.4 HIGH Cisco Nexus 3600-R and 9500-R Series Switching Platforms Layer 2 Loop Denial of Service Vu
CVE-2026-20099 6.7 MEDIUM Cisco UCS Manager and FXOS Software Command Injection Vulnerability
CVE-2026-20036 6.5 MEDIUM Cisco UCS Manager Software Command Injection Vulnerability
CVE-2026-20133 6.5 MEDIUM Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 信息泄露漏洞
CVE-2026-20107 5.5 MEDIUM Cisco Application Policy Infrastructure Controller Denial of Service Vulnerability
CVE-2026-20122 5.4 MEDIUM Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability
CVE-2026-20037 4.4 MEDIUM Cisco UCS Manager File Write Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Firepower Extensible Operating System (FXOS)
Same vendor: Cisco
Same weakness: CWE-79

V. Comments for CVE-2026-20091

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