CVE-2026-77990 Missing authorization in JEM - Joomla Event Manager extension for Joomla
Any logged-in user can read attendee lists for events they do not manage, exposing personal data. Site administrators should upgrade the extension.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77990?
CVE-2026-77990 is a medium-severity missing authorization vulnerability in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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attendee names, usernames, registration dates and statuses for events they do not manage, including lists belonging to unpublished events.
Weakness: CWE-639
Which versions are affected by CVE-2026-77990?
How do I fix CVE-2026-77990?
No fix has been published for CVE-2026-77990 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77990 being exploited?
There is no known exploitation of CVE-2026-77990 in the wild and no public exploit code.
Sources
Also known as GHSA-839q-fphm-4fh3.