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WordPress Booking Calendar plugin <= 11.8.4 - Race Condition vulnerability

CVSS 3.1 3.7 LOWCheck source for fixed versionsKEV status unknown

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-39601

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-39601

Published

booking

https://wordpress.org/plugins

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "WPdevelop",
                    "product": "Booking Calendar",
                    "packageName": "booking",
                    "collectionURL": "https://wordpress.org/plugins",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "versionType": "custom",
                            "status": "affected",
                            "lessThanOrEqual": "11.8.4",
                            "changes": [
                                {
                                    "at": "11.9",
                                    "status": "unaffected"
                                }
                            ]
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

ChangeIntel

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Sources read 12 Nov 15:26 UTC · 274 of 275 readable · 272 fully read · documentation 469/469 current