What’s Vulnerable › Vulnerabilities

CVE-2020-28903

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 13.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-24 · updated 2026-06-17
• Weakness: CWE-79

Description

Improper input validation in Nagios Fusion 4.1.8 and earlier allows a remote attacker with control over a fused server to inject arbitrary HTML, aka XSS.

Affected products

• Nagios Fusion: through 4.1.8

References

• http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.html
• https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/
• https://www.nagios.com/downloads/nagios-xi/change-log/
• http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.html
• https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/
• https://www.nagios.com/downloads/nagios-xi/change-log/

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