CVE-2026-77034: CWE-284 Improper Access Control in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla
Description
A vulnerability in the Joomla Event Manager (JEM) extension for Joomla allows unauthenticated users holding their own session token to overwrite and force-publish articles associated with events. This affects versions from 1.0.0 through 5.0.0. The issue is due to improper access control, classified as CWE-284. The vulnerability has a CVSS 4.0 base score of 6.9, indicating medium severity.
CVSS v4.0
Score 6.9medium
Affected software
joomlaeventmanager.net
JEM - Joomla Event Manager extension for Joomla
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77034 is an improper access control vulnerability in the Joomla Event Manager (JEM) extension for Joomla, versions 1.0.0 through 5.0.0. It allows any visitor who possesses their own session token to republish and overwrite articles linked to events without authentication. This could lead to unauthorized content modification within the Joomla site. The vulnerability is identified as CWE-284 and has a CVSS 4.0 score of 6.9, reflecting a medium severity level.
Potential Impact
An attacker with a valid session token can overwrite and force-publish articles associated with events without proper authorization. This could result in unauthorized content changes on the affected Joomla sites, potentially impacting content integrity and trustworthiness.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented at this time. Users should monitor the vendor's security advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-08-20T08:56:32.577Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8fd7c0acd9273b49e1758d
Added to database: 08/27/2026, 06:22:56 UTC
Last enriched: 09/10/2026, 09:10:18 UTC
Last updated: 10/10/2026, 18:48:22 UTC
Views: 75
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