CVE-2018-25121 — Nagios XI < 5.4.13 XSS via Views Page

Nagios XI versions prior to 5.4.13 are vulnerable to cross-site scripting (XSS) via the Views page 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.

Published Oct 30, 2025Updated Nov 17, 2025Sources: cvelistV5, VulnCheck

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

chance of exploitation in 30 days

Affects

nagios

CVSS base

5.1

MEDIUM

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script all four kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Vendors (1)

nagios

Products (1)

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
5.1	CVSS 4.0	MEDIUM	—	—	cvelistV5

Weakness & attack patterns

CWE-79

References

2 on the record

www.nagios.com/changelog/nagios-xi/
release-notes, patch
www.vulncheck.com/advisories/nagios-xi-xss-via-views-page
third-party-advisory

Elsewhere on this site

nagiosevery CVE for this vendor
CWE-79other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.