CVE-2026-87966 Easy Appointments 4.0 - 4.0.2.1 - Unauthenticated Arbitrary Appointment Modification and Deletion via IDOR
Unauthenticated attackers can modify or delete arbitrary appointments in Easy Appointments due to missing authorization checks on the reservation endpoint.
- 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-2026-87966?
CVE-2026-87966 is a medium-severity missing authorization vulnerability in Unknown Easy Appointments, published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Easy Appointments WordPress plugin before 4.0.2.2 does not perform an ownership or authorization check on its unauthenticated appointment-reservation endpoint before updating an existing appointment identified by a request-supplied id, allowing unauthenticated attackers to overwrite, and through a follow-on cleanup delete, arbitrary appointments.
Weakness: CWE-639
Which versions are affected by CVE-2026-87966?
How do I fix CVE-2026-87966?
No fix has been published for CVE-2026-87966 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-2026-87966 being exploited?
There is no known exploitation of CVE-2026-87966 in the wild and no public exploit code.
Sources
Also known as GHSA-52p7-4rrr-jvcv.