Vulnerability · Published Sep 19, 2026 · Assigned by WPScan

CVE-2026-91847Bookly < 28.2 - Unauthenticated AI Assistant Conversation Disclosure and Message Injection via IDOR

Medium 4.8

In plain English

A medium-severity authorization bypass via user-controlled key in Online Scheduling and Appointment Booking System from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.2%top 87.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The Online Scheduling and Appointment Booking System WordPress plugin before 28.2 does not verify that the requester owns the AI booking-assistant conversation named in its unauthenticated conversation actions, allowing any unauthenticated visitor to read another visitor's assistant messages and to inject messages into their in-progress conversation.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Online Scheduling and Appointment Booking System	28.1 – before 28.2

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

https://wpscan.com/vulnerability/9eef3086-3a67-4ee2-bd78-e346e7b05d62/ exploit, vdb-entry, technical-description