PT-2020-20126 · Joomla · Joomla!

Mayank Kumbhar · Published 2020-01-28 · Updated 2025-04-03 · CVE-2020-8421

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Joomla! versions prior to 3.9.15

Description An issue was discovered that allows XSS attacks due to inadequate escaping of usernames in com actionlogs.

Recommendations For versions prior to 3.9.15, update to version 3.9.15 or later to resolve the issue. As a temporary workaround, consider restricting access to com actionlogs to minimize the risk of exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-JOOMLA-2020-8421

CVE-2020-8421

Affected Products

Joomla!

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2020-8421 · Security Note
• https://osv.dev/vulnerability/BIT-joomla-2020-8421 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-8421 · Vendor Advisory
• https://developer.joomla.org/security-centre/800-20200103-core-xss-in-com-actionlogs · Vendor Advisory
• https://t.me/cvenotify/575 · Telegram Post