Nagios Log Server before 2.0.8 allows Reflected XSS via the username on the Login page.

published 2019-09-03 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-6809

cvss: 6.1; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.6%; EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits: 0; none known

Patch / fix

fixed in 1

nagios log_server 2.0.8

Exploit prediction

1.60% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/lucaottoni/reflectedxss_nagios/blob/master/README.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.1	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /lucaottoni/reflectedxss_nagios/blob/master/README.md
exploit, third-party-advisory
nagios.com /downloads/nagios-log-server/change-log/
vendor-advisory

Sources

CVE List CVE-2019-15898
NVD CVE-2019-15898

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