GemBooking <= 1.7.0 — Unauthenticated Team Member Double-Booking
CVE-2026-123128Published · Updated Action summary
Affected: ≤1.7.0Update to 1.7.1 or newer
All remediation steps- Severity
- Medium5.3
- CVSS
- 5.3CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
- Required access
- No account needed
- Exploit prediction (EPSS)
- 0.1% chance in 30 days3th percentile
- CISA KEV
- Not listed
On this page8
Am I affected?
GemBooking – Appointment Booking, Booking Calendar & Reservations gembooking
- Affected≤ 1.7.0
- Patched in1.7.1
Update to 1.7.1 or newer.
You are affected if you run ≤ 1.7.0. Version 1.7.1 and later are not affected by this issue.
- Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under GemBooking – Appointment Booking, Booking Calendar & Reservations.
- No admin access? Run a passive check of your site. It reads public files only.
- No account is needed to exploit this. Treat any exposed site on an affected version as at risk.
What to do
- Update to version 1.7.1, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
- Watch GemBooking – Appointment Booking, Booking Calendar & Reservations to get an email when the next vulnerability is published.
Advisory
Source description from Wordfence Intelligence, credited to Khalid Mostafa Ismail.
The GemBooking plugin for WordPress is vulnerable to Race Condition in all versions up to, and including, 1.7.0. This is due to a booking advisory lock scoped only to the bookable object_id, allowing concurrent requests on different bookables to race on shared team members, resources, or hosts without serialisation. This makes it possible for unauthenticated attackers to create overlapping confirmed bookings for the same team member by sending simultaneous booking requests against different bookable items, bypassing availability checks.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Related CVEs
More in GemBooking – Appointment Booking, Booking Calendar & Reservations
All 2| Severity | Vulnerability | CVE | Published |
|---|---|---|---|
| Medium4.3 | Missing Authorization ≤1.7.0Update to 1.7.1 | CVE-2026-123131 |
- Medium4.3Missing Authorization
≤1.7.0Update to 1.7.1
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.