Vulnerability · Published Feb 25, 2026 · Assigned by cisco
CVE-2026-20091Cisco UCS Manager and FXOS Software Stored Cross-Site Scripting Vulnerability
Medium 4.8
In plain English
A medium-severity cross-site scripting in Cisco Firepower Extensible Operating System (FXOS) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Firepower Extensible Operating System (FXOS) | 2.14.1.1312.14.1.1432.14.1.1632.14.1.1672.16.0.128 |
| Cisco | Cisco Secure Firewall Adaptive Security Appliance (ASA) Software | 9.12.29.12.19.12.39.12.49.12.3.29.12.3.129.12.2.59.12.1.2 |
| Cisco | Cisco 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) |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N