Vulnerability · Published Oct 30, 2025 · Assigned by VulnCheck
CVE-2021-47690Nagios XI < 5.8.2 Core Config Manager (CCM) XSS via Overlay Modals
Medium 5.1
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 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.4%top 63.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The Core Config Manager (CCM) in Nagios XI versions prior to CCM 3.1.1 / Nagios XI 5.8.2 contains multiple cross-site scripting (XSS) vulnerabilities in Overlay modals. 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 (as reported)
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References
- https://www.nagios.com/changelog/nagios-xi/ release-notes, patch
- https://www.vulncheck.com/advisories/nagios-xi-ccm-xss-via-overlay-modals third-party-advisory