CVE-2026-77991: Joomlaeventmanager.net Jem - Joomla Event Manager Extension For Joomla

Critical severity, CVSS 9.4. EPSS: 0.6% chance of exploitation in the next 30 days.

Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1 - The administrator source model allows to write dangerous file type incl. PHP, leading to remote code execution.

Affected products

• Joomlaeventmanager.net Jem - Joomla Event Manager Extension For Joomla: version 1.0.0-5.0.0 only

Published 2026-08-27. Last modified 2026-08-28.