CVE-2026-77991 Joomla Extension - joomlaeventmanager.net - Privileged remote code execution in Joomla Event Manager < 5.0.1
Privileged attackers can upload dangerous files like PHP to achieve remote code execution in Joomla Event Manager.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77991?
CVE-2026-77991 is a critical vulnerability in joomlaeventmanager.net JEM - Joomla Event Manager extension for Joomla, published on 27 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2026-77991?
How do I fix CVE-2026-77991?
No fix has been published for CVE-2026-77991 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77991 being exploited?
There is no known exploitation of CVE-2026-77991 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-gh3c-9wwf-mj2v.