The Favorites component before 1.0.2 for Nagios XI 5.8.0 is vulnerable to XSS.

published 2021-02-03 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-12847

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 25.5%; EPSS 25.5% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

Patch / fix

fixed in 1

nagios favorites 1.0.2

Exploit prediction

25.45% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/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

nagios.com /products/security/
vendor-advisory

Sources

CVE List CVE-2021-26023
NVD CVE-2021-26023

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