Vulnerability · Published Aug 27, 2026 · Assigned by Joomla
CVE-2026-77991Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1
Critical 9.4
In plain English
A critical-severity unrestricted file upload in JEM - Joomla Event Manager extension for Joomla from joomlaeventmanager.net. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| joomlaeventmanager.net | JEM - Joomla Event Manager extension for Joomla | 1.0.0-5.0.0 |
Weakness: CWE-434 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H