5.4

CVE-2020-8821: webmin Cross-site Scripting

CVSS: 5.4v3.1MediumModified
Published 12-10-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-8821 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in webmin. EPSS estimates a 79.06% chance of exploitation in the next 30 days, higher than 99.5% of scored vulnerabilities.

Overall risk
37/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (NVD)
EPSS score
79.06%
0%100%
Critical · -1.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2020-0400

Timeline

  1. 12-10-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

An Improper Data Validation Vulnerability exists in Webmin 1.941 and earlier affecting the Command Shell Endpoint. A user may enter HTML code into the Command field and submit it. Then, after visiting the Action Logs Menu and displaying logs, the HTML code will be rendered (however, JavaScript is not executed). Changes are kept across users.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

79.06%

Chance of exploitation in the next 30 days

Percentile

100%

Versus all other CVEs

30-day change

-1.16 pp

From 80.22% on 20-09-2026

20-09-202620-10-2026
EPSS score
79.06%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Webmin1 product

1 vendor · 1 product

References

1 links