CVE-2026-16540 Missing authorization in Simply Schedule Appointments
Unauthenticated attackers can access all appointment data and delete appointments due to missing authorization checks in the purge 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-2026-16540?
CVE-2026-16540 is a high-severity missing authorization vulnerability in Unknown Simply Schedule Appointments, published on 2 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Simply Schedule Appointments WordPress plugin before 1.6.12.6 does not correctly restrict a bulk appointment operation to the requester's own records, allowing unauthenticated users to retrieve the personal data of all appointments across the site and, on premium editions, to permanently delete them.
Weakness: CWE-863
Which versions are affected by CVE-2026-16540?
How do I fix CVE-2026-16540?
No fix has been published for CVE-2026-16540 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-2026-16540 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16540 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-j5pv-734r-xv95.