What’s Vulnerable › Vulnerabilities

CVE-2017-20209: Nagios Fusion < 4.0.1 XSS via Users/Servers Page

• 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 4.0.1 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.

Affected products

• Nagios Fusion: 4.0.0

References

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

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