CVE-2026-77991 PUBLISHED

Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1

Assigner: Joomla
Reserved: 21.08.2026 Published: 27.08.2026 Updated: 27.08.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 9.4

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	joomlaeventmanager.net
Product	JEM - Joomla Event Manager extension for Joomla
Versions	Default: unaffected Version 1.0.0-5.0.0 is affected

Credits

Phil Taylor, mysites.guru finder

References

https://www.joomlaeventmanager.net/

Problem Types

CWE-434 Unrestricted Upload of File with Dangerous Type CWE