CVE-2020-36862: nagios nagios_xi Cross-site Scripting

Vulnerability summary

CVE-2020-36862 is a medium (CVSS 6.9) Cross-site Scripting vulnerability in nagios nagios_xi. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 49.4% of scored vulnerabilities.

Timeline

1. 30-10-2025
   PublishedVulnerability first disclosed.
2. 17-11-2025
   Last modifiedVulnerability information updated.

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.

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
• CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.