CVE-2026-89063 Missing authorization in Online Scheduling and Appointment Booking System – Bookly
Unauthenticated attackers can read and inject messages into any customer's AI booking conversation due to missing authorization checks on the conversation ID.
- 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-2026-89063?
CVE-2026-89063 is a high-severity missing authorization vulnerability in ladela Online Scheduling and Appointment Booking System – Bookly, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Online Scheduling and Appointment Booking System – Bookly plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 28.1 via the 'conversation_id' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to read the full AI booking conversation transcript of any customer — leaking names, email addresses, phone numbers, and appointment details echoed by the assistant — and inject arbitrary messages into any victim conversation that are subsequently replayed to the Cloud AI worker along with the full private history. Because AI conversations are stored with no owner, user, or session identifier and conversation IDs are sequential integers, an unauthenticated attacker can enumerate all customer conversations simply by incrementing the conversation_id parameter.
Weakness: CWE-639
Which versions are affected by CVE-2026-89063?
How do I fix CVE-2026-89063?
No fix has been published for CVE-2026-89063 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-2026-89063 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89063 exists.
Public exploit code: 1 Nuclei template.
Sources
Also known as GHSA-f895-wc4g-97xv.