CVE-2020-8820

Name: CVE-2020-8820
Creator: NVD / NIST
Published: 2020-10-12T16:15:12.513+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2020-8820 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. An XSS Vulnerability exists in Webmin 1.941 and earlier affecting the Cluster Shell Commands Endpoint. A user may enter any XSS Payload into the Command field and execute it. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

An XSS Vulnerability exists in Webmin 1.941 and earlier affecting the Cluster Shell Commands Endpoint. A user may enter any XSS Payload into the Command field and execute it. Then, after revisiting the Cluster Shell Commands Menu, the XSS Payload will be rendered and executed.

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

0.56%

42.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Webmin	Webmin	<= 1.941

References

https://www.webmin.com/security.htmlVendor Advisory
https://www.webmin.com/security.htmlVendor Advisory

Timeline

Published: Oct 12, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8820?

How severe is CVE-2020-8820?

CVE-2020-8820 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8820?

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-2020-8820?

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

Scan your code now

Source: NVD / NIST