What is CVE-2026-91847?

CVE-2026-91847 is a medium-severity vulnerability in Online Scheduling And Appointment Booking System, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.8/10. Published 2026-09-19.

How severe is CVE-2026-91847?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Auth bypass in Online Scheduling And Appointment Booking System

CVE-2026-91847

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.

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

Affected products

Unknown Online Scheduling And Appointment Booking System

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-91847?: CVE-2026-91847 is a medium-severity vulnerability in Online Scheduling And Appointment Booking System, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.8/10. Published 2026-09-19.
How severe is CVE-2026-91847?: Medium severity. CVSS v3 base score is 4.8 out of 10.