CVE-2018-25119: Nagios Fusion < 4.1.5 XSS via fusionwindow Parameter

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-30 · updated 2026-10-18
Weakness: CWE-79

Description

Nagios Fusion versions prior to 4.1.5 are vulnerable to cross-site scripting (XSS) via the "fusionwindow" parameter. 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.

Affected products

Nagios Fusion: before 4.1.5 — fixed in 4.1.5

How to fix

Upgrade to a fixed version: Nagios Fusion 4.1.5. Check the vendor advisory for mitigations.

References

https://www.nagios.com/changelog/nagios-fusion/
https://www.vulncheck.com/advisories/nagios-fusion-xss-via-fusionwindow-parameter

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