Nagios XI before 5.5.4 has XSS in the auto login admin management page.

published 2019-07-10 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8922

cvss: 4.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.6%; EPSS 2.6% chance of exploitation in 30 days, percentile 85%
public exploits: 0; none known

Patch / fix

fixed in 1

nagios nagios_xi 5.5.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-17147 updated 2025-11-21 cvss 6.1

Nagios-XI: cross-site scripting in login admin management page

Red Hat Storage 3 nagios, nagios-common
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.65% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.0	4.8	CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

assets.nagios.com /downloads/nagiosxi/CHANGES-5.TXT
release-notes, vendor-advisory
securityfocus.com /bid/109116
vdb-entry, third-party-advisory

Sources

CVE List CVE-2018-17147
NVD CVE-2018-17147

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary