CVE-2021-38156

Name: CVE-2021-38156
Creator: NVD / NIST
Published: 2021-09-15T14:15:08.83+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 88.94%

Last modified Jun 17, 2026

CVE-2021-38156 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard.. EPSS estimates a 88.94% chance of exploitation in the next 30 days.

Description

In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

88.94%

99.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Nagios	Nagios Xi	< 5.8.6

References

https://raxis.com/blog/cve-2021-38156Exploit, Third Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory
https://raxis.com/blog/cve-2021-38156Exploit, Third Party Advisory
https://www.nagios.com/downloads/nagios-xi/change-log/Release Notes, Vendor Advisory

Timeline

Published: Sep 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-38156?

In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard.

How severe is CVE-2021-38156?

CVE-2021-38156 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 88.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-38156?

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-2021-38156?

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

Scan your code now

Source: NVD / NIST