Vulnerability · Published Oct 30, 2025 · Assigned by VulnCheck
CVE-2020-36862Nagios XI < 5.6.11 Unauthenticated XSS and SSRF via Highcharts
Medium 6.9
In plain English
A medium-severity cross-site scripting in XI from Nagios. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 50% of all known vulnerabilities).
Official description
Nagios XI versions prior to 5.6.11 contain unauthenticated vulnerabilities in the Highcharts local exporting tool. Crafted export requests could (1) inject script into exported/returned content due to insufficient output encoding (XSS), and (2) cause the server to fetch attacker-specified URLs (SSRF), potentially accessing internal network resources. An unauthenticated remote attacker can leverage these issues to execute script in a user's browser when the exported content is viewed and to disclose sensitive information reachable from the export server via SSRF.
Affected products (as reported)
Weakness: CWE-79, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
References
- https://www.nagios.com/changelog/nagios-xi/ release-notes, patch
- https://www.vulncheck.com/advisories/nagios-xi-unauthenticated-xss-and-ssrf-via-highcharts third-party-advisory