BaseFortify

Publication date: 2025-11-03

Last updated on: 2025-11-07

Assigner: VulnCheck

Description

Nagios XI versions prior to 5.8.7 using embedded Nagios Core are vulnerable to cross-site scripting (XSS) via the Core UI’s Views URL handling (escape_string()). 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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-03

Last Modified

2025-11-07

Generated

2026-07-06

AI Q&A

2025-11-03

EPSS Evaluated

2026-07-05

NVD

CVE-2021-47698

Affected Vendors & Products

Vendor	Product	Version / Range
nagios	nagios_xi	to 5.8.7 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	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.

Attack-Flow Graph

Executive Summary

This vulnerability in Nagios XI versions prior to 5.8.7 involves cross-site scripting (XSS) through the embedded Nagios Core's Views URL handling. Due to insufficient validation or escaping of user-supplied input, an attacker can inject and execute arbitrary scripts in the context of a victim's browser.

Impact Analysis

An attacker exploiting this vulnerability could execute arbitrary scripts in a victim's browser, potentially leading to session hijacking, defacement, or other malicious actions performed on behalf of the victim within the affected application.

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