CVE-2026-77990
Received Received - Intake

Information Disclosure in Joomla Event Manager Extension

Publication date: 2026-08-27

Last updated on: 2026-08-27

Assigner: Joomla! Project

Description
Joomla Extension - joomlaeventmanager.net - Attendee lists readable by any logged-in user in Joomla Event Manager < 5.0.1 - A non-manager can therefore read attendee names, usernames, registration dates and statuses for events they do not manage, including lists belonging to unpublished events.

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Meta Information

Published
2026-08-27
Last Modified
2026-08-27
Generated
2026-08-27
AI Q&A
2026-08-27
EPSS Evaluated
N/A
NVD
CVE-2026-77990
EUVD
EUVD-2026-66864

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
joomlaeventmanager joomla_event_manager to 5.0.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

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Executive Summary

This vulnerability in Joomla Event Manager (versions before 5.0.1) allows any logged-in user to access attendee lists for events they do not manage. Attackers can view sensitive details like attendee names, usernames, registration dates, and statuses, even for unpublished events.

Detection Guidance

Check Joomla Event Manager versions below 5.0.1 for exposed attendee lists. Log in as a non-manager user and attempt to access event attendee pages to verify unauthorized data exposure.

Impact Analysis

If you use Joomla Event Manager, unauthorized users may access private attendee data. This could lead to privacy breaches, data leaks, or misuse of personal information. The impact depends on the sensitivity of the event data stored.

Compliance Impact

This vulnerability may violate GDPR and HIPAA by exposing personal data without authorization. GDPR requires protecting personal data, while HIPAA mandates safeguarding health-related information. Non-compliance could result in legal penalties.

Mitigation Strategies

Update Joomla Event Manager to version 5.0.1 or later immediately. Review event attendee permissions and restrict access to authorized managers only.

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