CVE-2026-77991

CRITICAL CVSS 4.0: 9.4 EPSS 0.41%
Updated Aug 27, 2026
Joomla
Parameter Value
CVSS 9.4 (CRITICAL)
Type CWE-434 (Unrestricted File Upload)
Vendor Joomla
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v4.0