CVE-2026-39601 PUBLISHED

WordPress Booking Calendar plugin <= 11.8.4 - Race Condition vulnerability

Assigner: Patchstack
Reserved: 07.04.2026 Published: 02.10.2026 Updated: 02.10.2026

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in WPdevelop Booking Calendar booking allows Leveraging Race Conditions.This issue affects Booking Calendar: from n/a through 11.8.4.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS Score: 3.7

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	Low
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	WPdevelop
Product	Booking Calendar
Versions	Default: unaffected affected from 0 to 11.8.4 (incl.)

Credits

Ananda Dhakal (Patchstack) finder

References

https://patchstack.com/database/wordpress/plugin/booking/vulnerability/wordpress-booking-calendar-plugin-11-8-4-race-condition-vulnerability?_s_id=cve

Problem Types

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CWE

Impacts

Leveraging Race Conditions