CVE-2020-28903
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 13.20% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- nagios/fusion
- Source
- cve@mitre.org
EPSS moved from 13.2% on 10 October 2026 to 13.2% on 3 November 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory, VDB Entry
- https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit, Third Party Advisory
- https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory
- http://packetstormsecurity.com/files/162783/Nagios-XI-Fusion-Privilege-Escalation-Cross-Site-Scripting-Code-Execution.htmlThird Party Advisory, VDB Entry
- https://skylightcyber.com/2021/05/20/13-nagios-vulnerabilities-7-will-shock-you/Exploit, Third Party Advisory
- https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.