CVE-2026-22351 WordPress WP FullCalendar plugin <= 1.6 - Broken Access Control vulnerability
Attackers can bypass access controls in the WP FullCalendar plugin to perform unauthorized actions due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-22351?
CVE-2026-22351 is a high-severity missing authorization vulnerability in Marcus (aka @msykes) WP FullCalendar, published on 20 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing Authorization vulnerability in Marcus (aka @msykes) WP FullCalendar wp-fullcalendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects WP FullCalendar: from n/a through <= 1.6.
Weakness: CWE-862
Which versions are affected by CVE-2026-22351?
How do I fix CVE-2026-22351?
No fix has been published for CVE-2026-22351 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-2026-22351 being exploited?
There is no known exploitation of CVE-2026-22351 in the wild and no public exploit code.
Sources
Also known as GHSA-6v87-78cw-pw29.