Vulnerability · Published Oct 30, 2025 · Assigned by VulnCheck

CVE-2023-53690Nagios Fusion < 4.2.0 LDAP/AD Integration Stored XSS

Medium 6.2

In plain English

A medium-severity cross-site scripting in Fusion from Nagios. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities).

Severity (CVSS 4.0)6.2Medium

Exploit odds (30 days)0.8%top 42.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Nagios Fusion versions prior to 4.2.0 contain a stored cross-site scripting (XSS) vulnerability in the LDAP/AD authentication-server configuration. Unsanitized user input can be stored and later rendered in the administrative UI, causing JavaScript to execute in the browser of any user who views the affected page. An attacker who can add authentication servers via LDAP/AD integration could persist a malicious payload that executes in the context of other users' browsers.

Affected products (as reported)

Vendor	Product	Versions
Nagios	Fusion	0 – before 4.2.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

References

https://www.nagios.com/products/security/#fusion vendor-advisory, patch
https://www.nagios.com/changelog/nagios-fusion/ release-notes, patch
https://www.vulncheck.com/advisories/nagios-fusion-ldap-ad-integration-stored-xss third-party-advisory