4.8

CVE-2026-20091: cisco cisco firepower extensible operating system (fxos) Cross-site Scripting

CVSS: 4.8v3.1MediumDeferred
Published 25-02-2026Last modified 25-02-2026
Open JSON

Vulnerability summary

CVE-2026-20091 is a medium (CVSS 4.8) Cross-site Scripting vulnerability in cisco cisco firepower extensible operating system (fxos). EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 7.1% of scored vulnerabilities.

Overall risk
19/100
0100
Low · default modelHow is this calculated?
CVSS score
4.8/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-02-2026
    PublishedVulnerability first disclosed.
  2. 25-02-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.01 pp

From 0.17% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco3 products
  • cisco 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
  • cisco 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 | 9.12.4.24 | 9.16.1 | 9.12.4.26 | 9.16.1.28 | 9.12.4.29 | 9.16.2 | 9.12.4.30 | 9.16.2.3 | 9.12.4.35 | 9.16.2.7 | 9.12.4.37 | 9.17.1 | 9.16.2.11 | 9.16.2.13 | 9.12.4.39 | 9.12.4.38 | 9.16.2.14 | 9.17.1.7 | 9.12.4.40 | 9.16.3.3 | 9.16.3 | 9.17.1.9 | 9.16.3.14 | 9.12.4.41 | 9.17.1.10 | 9.18.1 | 9.12.4.47 | 9.16.3.15 | 9.18.1.3 | 9.17.1.11 | 9.12.4.48 | 9.18.2 | 9.16.3.19 | 9.17.1.13 | 9.12.4.50 | 9.17.1.15 | 9.12.4.52 | 9.16.3.23 | 9.18.2.5 | 9.16.4 | 9.12.4.54 | 9.17.1.20 | 9.18.2.7 | 9.19.1 | 9.16.4.9 | 9.12.4.55 | 9.18.2.8 | 9.16.4.14 | 9.18.3 | 9.19.1.5 | 9.12.4.56 | 9.17.1.30 | 9.19.1.9 | 9.18.3.39 | 9.16.4.19 | 9.12.4.58 | 9.19.1.12 | 9.18.3.46 | 9.16.4.27 | 9.19.1.18 | 9.18.3.53 | 9.18.3.55 | 9.16.4.38 | 9.17.1.33 | 9.12.4.62 | 9.16.4.39 | 9.18.3.56 | 9.16.4.42 | 9.19.1.22 | 9.18.4 | 9.18.4.5 | 9.19.1.24 | 9.16.4.48 | 9.18.4.8 | 9.20.2 | 9.19.1.27 | 9.12.4.65 | 9.16.4.55 | 9.18.4.22 | 9.20.2.10 | 9.16.4.57 | 9.19.1.28 | 9.17.1.39 | 9.12.4.67 | 9.18.4.24 | 9.20.2.21 | 9.16.4.61 | 9.19.1.31 | 9.18.4.29 | 9.20.2.22 | 9.16.4.62 | 9.18.4.34 | 9.20.3 | 9.16.4.67 | 9.18.4.40 | 9.16.4.71 | 9.20.3.4 | 9.18.4.47 | 9.20.3.7 | 9.17.1.45 | 9.19.1.37 | 9.16.4.76 | 9.18.4.50 | 9.20.3.10 | 9.18.4.52 | 9.20.3.13 | 9.18.4.53 | 9.16.4.82 | 9.20.3.16 | 9.19.1.42 | 9.18.4.57 | 9.16.4.84 | 9.20.3.20
  • 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) | 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) | 4.1(1d) | 4.0(4i) | 4.1(1e) | 4.1(2b) | 4.0(4k) | 4.1(3a) | 4.1(3b) | 4.1(2c) | 4.0(4l) | 4.1(4a) | 4.1(3c) | 4.1(3d) | 4.2(1c) | 4.2(1d) | 4.0(4m) | 4.1(3e) | 4.2(1f) | 4.1(3f) | 4.2(1i) | 4.1(3h) | 4.2(1k) | 4.2(1l) | 4.0(4n) | 4.2(1m) | 4.1(3i) | 4.2(2a) | 4.2(1n) | 4.1(3j) | 4.2(2c) | 4.2(2d) | 4.2(3b) | 4.1(3k) | 4.0(4o) | 4.2(2e) | 4.2(3d) | 4.2(3e) | 4.2(3g) | 4.1(3l) | 4.3(2b) | 4.2(3h) | 4.2(3i) | 4.3(2c) | 4.1(3m) | 4.3(2e) | 4.3(3a) | 4.2(3j) | 4.3(3c) | 4.3(4a) | 4.2(3k) | 4.3(4b) | 4.3(4c) | 4.2(3l) | 4.3(4d) | 4.3(2f) | 4.2(3m) | 4.3(5a) | 4.3(4e) | 4.1(3n) | 4.3(4f) | 4.2(3n) | 4.3(5c) | 4.2(3o) | 4.3(5d) | 4.3(5e) | 4.2(3p)

1 vendor · 3 products

References

1 links