Nagios XI < 2011R1.9 XSS via Recurring Downtime Script

Advisories

severity: medium
date: October 30, 2025
Affecting: XI < 2011R1.9
CVE: CVE-2011-10038
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
CVSS: 5.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References: Nagios XI Changelog
Credit: 0a29406d9794e4f9b30b3c5d6702c708
Description: Nagios XI versions prior to 2011R1.9 are vulnerable to cross-site scripting (XSS) via the recurring downtime script of the web interface. 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.