CVE-2017-20209

Nagios Fusion versions prior to 4.0.1 are vulnerable to cross-site scripting (XSS) via the Users and Servers pages. Insufficient validation or escaping of user-supplied input may allow an attacker to inject and execute arbitrary script in the context of a victim's browser.

CVSS 4.0

5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

6.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2025-10-30

Modified

2026-10-18

Record from

the NVD, synced 2026-10-19

Affected

• nagios:fusion

References

• https://www.nagios.com/changelog/nagios-fusion/
• https://www.vulncheck.com/advisories/nagios-fusion-xss-via-users-servers-page

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