Description
Nagios XI versions prior to 2024R1.2.2 contain a host header injection vulnerability. The application trusts the user-supplied HTTP Host header when constructing absolute URLs without sufficient validation. An unauthenticated, remote attacker can supply a crafted Host header to poison generated links or responses, which may facilitate phishing of credentials, account recovery link hijacking, and web cache poisoning.
References (3)
Core 3
Core References
Vendor Advisory vendor-advisory
patch
https://www.nagios.com/products/security/#nagios-xi
Release Notes release-notes
patch
https://www.nagios.com/changelog/nagios-xi/
Third Party Advisory third-party-advisory
https://www.vulncheck.com/advisories/nagios-xi-host-header-injection
Scores
CVSS v3
6.1
EPSS
0.0038
EPSS Percentile
29.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-346
Status
published
Products (2)
nagios/nagios_xi
2024 r1 (11 CPE variants)
nagios/nagios_xi
< 2024
Published
Oct 30, 2025
Tracked Since
Feb 18, 2026