---
id: CVE-2024-13993
title: >-
  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
summary: >-
  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…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: nagios
product: nagios_xi
affected:
  - nagios_xi < 2024
  - nagios_xi = 2024
patched:
  - nagios_xi 2024
published: '2025-10-30'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T00:10:00.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-13993'
references:
  - url: 'https://www.nagios.com/changelog/nagios-xi/'
    label: disclosure@vulncheck.com
  - url: 'https://www.nagios.com/products/security/#nagios-xi'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/nagios-xi-reflected-xss-via-login-page-on-older-browsers
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00795
epssPercentile: 0.54827
ingestedAt: '2026-10-02T01:05:54.704Z'
---

## Overview

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.

## Affected

- `nagios_xi < 2024`
- `nagios_xi = 2024`

## Remediation

Upgrade past the affected range:

- `nagios_xi 2024`