Reference page — cumulative record through Monday, October 5, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N H N N U N L N 3.7 .0016 4.1 —
AFFECTED Product Versions Fixed Booking Calendar unspecified 11.9
TIMELINE Apr 7 Reserved by Patchstack Oct 2 Published (CNA: Patchstack) Oct 4 PATCH SHIPPED — CVE-2026-39601 (WPdevelop Booking Calendar). Fixed in Booking Calendar 11.9.
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.
| Date | Event | Detail |
|---|---|---|
| April 7, 2026 | Reserved | Reserved by Patchstack |
| October 2, 2026 | Published | Published (CNA: Patchstack) |
| October 4, 2026 | PATCH SHIPPED | PATCH SHIPPED — CVE-2026-39601 (WPdevelop Booking Calendar). Fixed in Booking Calendar 11.9. |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| WPdevelop | Booking Calendar | — | — | 11.9 |
Authoritative record: CVE-2026-39601 at cve.org
Vendors: wpdevelop
Weaknesses: CWE-362
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-39601 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 5, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
