What’s Vulnerable › Vulnerabilities

CVE-2023-40932

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-19 · updated 2026-07-09
• Weakness: CWE-79

Description

A Cross-site scripting (XSS) vulnerability in Nagios XI version 5.11.1 and below allows authenticated attackers with access to the custom logo component to inject arbitrary javascript or HTML via the alt-text field. This affects all pages containing the navbar including the login page which means the attacker is able to to steal plaintext credentials.

Affected products

• Nagios XI: before 5.11.2 — fixed in 5.11.2

How to fix

Upgrade to a fixed version: Nagios XI 5.11.2. Check the vendor advisory for mitigations.

References

• https://outpost24.com/blog/nagios-xi-vulnerabilities/
• https://www.nagios.com/products/security/
• https://outpost24.com/blog/nagios-xi-vulnerabilities/
• https://www.nagios.com/products/security/

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