CVE-2021-26023

Name: CVE-2021-26023
Creator: NVD / NIST
Published: 2021-02-03T22:15:11.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 25.18%

Last modified Jun 17, 2026

CVE-2021-26023 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. The Favorites component before 1.0.2 for Nagios XI 5.8.0 is vulnerable to XSS.. EPSS estimates a 25.18% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

25.18%

97.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Nagios	Favorites	< 1.0.2

References

https://www.nagios.com/products/security/Vendor Advisory
https://www.nagios.com/products/security/Vendor Advisory

Timeline

Published: Feb 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26023?

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

How severe is CVE-2021-26023?

CVE-2021-26023 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 25.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26023?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26023?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST