Medium 5.1Published Oct 30, 2025

CVE-2024-13993Nagios XI < 2024R1.1.2 Reflected XSS via Login Page on Older Browsers

Updated under an hour ago (Oct 26, 2026, 10:30 AM ET)

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It affects Nagios XI and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Nagios XI

Exploited in the last 30 days

Nagios XI versions prior to < 2024R1.1.2 are vulnerable to a reflected cross-site scripting (XSS) via the login page when accessed with older web browsers. Insufficient validation or escaping of user-supplied input reflected by the login page can allow an attacker to craft a malicious link that, when visited by a victim, executes arbitrary JavaScript in the victim’s browser within the Nagios XI origin. The issue is observable under legacy browser behaviors; modern browsers may mitigate some vectors.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Analyzed
Record last updated: Nov 17, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Nagios XI nagios:xi (from the name)	before 2024R1.1.2	CNA record
nagios nagios_xi nagios:nagios_xi	before 2024; 2024; 2024; 2024; 2024	NVD

References

https://www.nagios.com/products/security/#nagios-xivendor-advisory, patch
https://www.nagios.com/changelog/nagios-xi/release-notes, patch
https://www.vulncheck.com/advisories/nagios-xi-reflected-xss-via-login-page-on-older-browsersthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.