Concurrency Flaw in GemBooking WordPress Plugin by WP Travel
CVE-2026-123128

Currently unrated

Key Information:

Vendor

WordPress
Status
Gembooking
Vendor
CVE Published:
9 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-123128?

The GemBooking WordPress plugin prior to version 1.7.1 has a significant concurrency flaw. This vulnerability permits unauthenticated users to initiate multiple booking requests that can overlap for the same team member. By exploiting this issue, attackers can create simultaneous confirmed bookings across various bookable items without authentication, posing a substantial risk to service availability and functionality.

Affected Version(s)

GemBooking 0 < 1.7.1

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-2026-123128 - Proof of Concept

References

https://wpscan.com/vulnerability/e6dd290d-358b-4d03-a585-...
exploitvdb-entrytechnical-description

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Khalid Mostafa Ismail
WPScan
.