CVE-2026-91847CWE-639

CVE-2026-91847

Medium · published September 19, 2026

CVSS v3.1
4.8
EPSS
0%
Percentile
11.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.8 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00217 · 11.5th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-19T11:16Z
References (1)
https://wpscan.com/vulnerability/9eef3086-3a67-4ee2-bd78-e346e7b05d62/ · [email protected]
EPSS history
Timeline
  • 20 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 19 SEP 06:00Z
    Bookly < 28.2 - Unauthenticated AI Assistant Conversation Disclosure and Message Injection via IDOR
    cvelistv5