Nagios XI 5.5.6 allows persistent cross site scripting from remote authenticated attackers via the stored email address in admin/users.php.

published 2018-11-14 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7583

cvss: 5.4; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.2%; EPSS 7.2% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

Exploit prediction

7.17% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

tenable.com https://www.tenable.com/security/research/tra-2018-37 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	5.4	CVSS:3.0/AV:N/AC:L/PR:L/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

Affected products

Nagios Nagios XI

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

tenable.com /security/research/tra-2018-37
exploit, third-party-advisory

Sources

CVE List CVE-2018-15713
NVD CVE-2018-15713

Fencer Vulns 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