• Project: Joomla!
  • SubProject: CMS
  • Impact: Moderate
  • Severity: Low
  • Versions: 3.6.0 through 3.9.6
  • Exploit type: XSS
  • Reported Date: 2019-January-01
  • Fixed Date: 2019-June-11
  • CVE Number: CVE-2019-12766


The subform fieldtype does not sufficiently filter or validate input of subfields, this leads to XSS attack vectors.

Affected Installs

Joomla! CMS versions 3.6.0 through 3.9.6


Upgrade to version 3.9.7


The JSST at the Joomla! Security Centre.

Reported By: Volkmar Schlothauer, ghsvs.de