CVE-2026-39601

WordPress Booking Calendar plugin <= 11.8.4 - Race Condition vulnerability

Published Oct 2, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

Update the WordPress Booking Calendar plugin to the latest available version (at least 11.9).

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Wordpress-extensions
Wordpress-extensions booking Calendar
Wpdevelop
Wpdevelop booking Calendar
Vendors & Products Wordpress-extensions
Wordpress-extensions booking Calendar
Wpdevelop
Wpdevelop booking Calendar
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title WordPress Booking Calendar plugin <= 11.8.4 - Race Condition vulnerability
Weaknesses CWE-362
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Patchstack
Published
Updated
Oct 5, 2026, 7:01 AM
Reserved
Apr 7, 2026, 10:48 AM
Status
Deferred
Published
Oct 2, 2026, 3:17 PM
Modified
Oct 5, 2026, 8:17 AM