Nagios XI 5.6.11 allows XSS via the includes/components/ldap_ad_integration/ password parameter.

published 2020-03-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3226

cvss: 4.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 19.1%; EPSS 19.1% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

Exploit prediction

19.11% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

code610.blogspot.com https://code610.blogspot.com/2020/03/nagios-5611-xssd.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.8	CVSS:3.1/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

code610.blogspot.com /2020/03/nagios-5611-xssd.html
exploit, third-party-advisory

Sources

CVE List CVE-2020-10820
NVD CVE-2020-10820

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