CVE-2026-77035 PUBLISHED

Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through forged form fields in Joomla Event Manager < 5.0.1

Assigner: Joomla
Reserved: 20.08.2026 Published: 27.08.2026 Updated: 27.08.2026

Joomla Extension - joomlaeventmanager.net - Cross-user event and venue takeover through forged form fields in Joomla Event Manager < 5.0.1 - A registered user with edit-own rights (the eventowner=1 setting or core.edit.own) can POST another user's record id together with their own id as created_by and take over that record.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
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-639: Authorization Bypass Through User-Controlled Key CWE