PT-2021-16925 · Joomla · Joomla!

Adrian Tiron · Published 2021-05-26 · Updated 2025-04-03 · CVE-2021-26032

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 3.0.0 through 3.9.26

Description An issue was discovered where HTML was missing in the executable block list of MediaHelper::canUpload(), leading to XSS attack vectors.

Recommendations For Joomla! versions 3.0.0 through 3.9.26, update to a version that includes the fix for the MediaHelper::canUpload() issue. As a temporary workaround, consider restricting the upload functionality to minimize the risk of exploitation.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-JOOMLA-2021-26032

CVE-2021-26032

Affected Products

Joomla!

References · 5

• https://osv.dev/vulnerability/BIT-joomla-2021-26032 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-26032 · Security Note
• https://developer.joomla.org/security-centre/852-20210501-core-adding-html-to-the-executable-block-list-of-mediahelper-canupload.html · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-26032 · Vendor Advisory
• https://t.me/cvenotify/15232 · Telegram Post