CVE-2026-5693 Smart Appointment & Booking <= 1.0.8 - Missing Authorization to Unauthenticated Arbitrary Booking Cancellation
Unauthenticated attackers can cancel arbitrary bookings in the Smart Appointment & Booking WordPress plugin due to a flawed nonce validation check.
- 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-2026-5693?
CVE-2026-5693 is a medium-severity missing authorization vulnerability in zealopensource Smart Appointment & Booking, published on 12 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Smart Appointment & Booking plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check and a nonce validation logic flaw in the saab_cancel_booking() function in all versions up to, and including, 1.0.8. The nonce check uses && (AND) instead of || (OR), which means providing any value for the security parameter causes the entire check to be skipped. This makes it possible for unauthenticated attackers to cancel arbitrary bookings by supplying a predictable booking ID.
Weakness: CWE-862
Which versions are affected by CVE-2026-5693?
How do I fix CVE-2026-5693?
No fix has been published for CVE-2026-5693 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-2026-5693 being exploited?
There is no known exploitation of CVE-2026-5693 in the wild and no public exploit code.
Sources
Also known as GHSA-jx49-jgx5-x37f.