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

Timeline

Scores

EPSS (exploitation in 30 days)

0.20% · top 90% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.

Affected products

• Cisco · Cisco Firepower Extensible Operating System (FXOS)

  • affected 2.14.1.131
  • affected 2.14.1.143
  • affected 2.14.1.163
  • affected 2.14.1.167
  • affected 2.16.0.128

• Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software

  • affected 9.12.2
  • affected 9.12.1
  • affected 9.12.3
  • affected 9.12.4
  • affected 9.12.3.2
  • affected 9.12.3.12
  • affected 9.12.2.5
  • affected 9.12.1.2
  • affected 9.12.2.1
  • affected 9.12.3.7
  • affected 9.12.2.9
  • affected 9.12.3.9
  • affected 9.12.1.3
  • affected 9.12.4.2
  • affected 9.12.4.4
  • affected 9.12.4.7
  • affected 9.12.4.8
  • affected 9.12.4.10
  • affected 9.12.4.13
  • affected 9.12.4.18
  • affected 9.12.4.24
  • affected 9.16.1
  • affected 9.12.4.26
  • affected 9.16.1.28
  • affected 9.12.4.29
  • affected 9.16.2
  • affected 9.12.4.30
  • affected 9.16.2.3
  • affected 9.12.4.35
  • affected 9.16.2.7
  • affected 9.12.4.37
  • affected 9.17.1
  • affected 9.16.2.11
  • affected 9.16.2.13
  • affected 9.12.4.39
  • affected 9.12.4.38
  • affected 9.16.2.14
  • affected 9.17.1.7
  • affected 9.12.4.40
  • affected 9.16.3.3
  • and 93 more

• Cisco · Cisco Unified Computing System (Managed)

  • affected 4.0(4h)
  • affected 4.1(1a)
  • affected 4.0(1c)
  • affected 4.0(4a)
  • affected 4.0(1a)
  • affected 4.0(1d)
  • affected 4.1(1c)
  • affected 4.0(2a)
  • affected 4.0(4g)
  • affected 4.0(2e)
  • affected 4.0(4c)
  • affected 4.0(4f)
  • affected 4.0(1b)
  • affected 4.0(2b)
  • affected 4.0(2d)
  • affected 4.1(1b)
  • affected 4.0(4d)
  • affected 4.0(4e)
  • affected 4.0(4b)
  • affected 4.1(2a)
  • affected 4.1(1d)
  • affected 4.0(4i)
  • affected 4.1(1e)
  • affected 4.1(2b)
  • affected 4.0(4k)
  • affected 4.1(3a)
  • affected 4.1(3b)
  • affected 4.1(2c)
  • affected 4.0(4l)
  • affected 4.1(4a)
  • affected 4.1(3c)
  • affected 4.1(3d)
  • affected 4.2(1c)
  • affected 4.2(1d)
  • affected 4.0(4m)
  • affected 4.1(3e)
  • affected 4.2(1f)
  • affected 4.1(3f)
  • affected 4.2(1i)
  • affected 4.1(3h)
  • and 45 more

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-8670 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-20091](https://cveledger.app/badge/CVE-2026-20091.svg)](https://cveledger.app/cve/CVE-2026-20091)

Record last updated 25 Feb 2026, 19:05 UTC.