How severe is CVE-2020-8820?

CVE-2020-8820 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-8820 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8820?

CVE-2020-8820 affects Webmin. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8820?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-8820 published?

CVE-2020-8820 was published on 2020-10-12 and last updated on 2026-06-17.

CVE-2020-8820

CVE-2020-8820 is a medium-severity vulnerability in Webmin with a CVSS 3.x base score of 5.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
CVSS v2: 3.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Webmin
Published: 2020-10-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-8820?: 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.
How severe is CVE-2020-8820?: CVE-2020-8820 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-8820 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8820?: CVE-2020-8820 affects Webmin. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8820?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-8820 published?: CVE-2020-8820 was published on 2020-10-12 and last updated on 2026-06-17.

References

https://www.webmin.com/security.html

Affected products (1)

cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:*

More vulnerabilities in Webmin

CVE-2005-1177 — Critical (CVSS 10.0): Unknown vulnerability in (1) Webmin and (2) Usermin before 1.200 causes Webmin to change permissions and ownership of…
CVE-2003-0101 — Critical (CVSS 10.0): miniserv.pl in (1) Webmin before 1.070 and (2) Usermin before 1.000 does not properly handle metacharacters such as…
CVE-2002-2201 — Critical (CVSS 10.0): The Printer Administration module for Webmin 0.990 and earlier allows remote attackers to execute arbitrary commands…
CVE-2001-1196 — Critical (CVSS 10.0): Directory traversal vulnerability in edit_action.cgi of Webmin Directory 0.91 allows attackers to gain privileges via a…
CVE-2022-36446 — Critical (CVSS 9.8): software/apt-lib.pl in Webmin before 1.997 lacks HTML escaping for a UI command.
CVE-2020-35769 — Critical (CVSS 9.8): miniserv.pl in Webmin 1.962 on Windows mishandles special characters in query arguments to the CGI program.

All CVEs affecting Webmin →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →