Unauthenticated Access Flaw in Online Scheduling Plugin for WordPress
CVE-2026-91847

4.8MEDIUM

Key Information:

Vendor

WordPress
Status
Online Scheduling And Appointment Booking System
Vendor
CVE Published:
19 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-91847?

The Online Scheduling and Appointment Booking System WordPress plugin prior to version 28.2 fails to validate the ownership of conversations in its unauthenticated actions. This oversight permits any visitor to gain unauthorized access to messages within another user's AI booking-assistant conversation and potentially inject messages into ongoing discussions. This vulnerability raises serious privacy and security concerns for users relying on this scheduling system.

Affected Version(s)

Online Scheduling and Appointment Booking System 28.1 < 28.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-91847 - Proof of Concept

References

https://wpscan.com/vulnerability/9eef3086-3a67-4ee2-bd78-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

vuxvinh
WPScan
.