CVE-2026-105193: Unknown Booking Calendar

Medium severity, CVSS 4.8. EPSS: 0.1% chance of exploitation in the next 30 days.

The Booking Calendar WordPress plugin before 11.8 does not generate its per-booking access hashes with sufficient entropy, deriving each from a low-entropy time-seeded value, which can allow unauthenticated attackers who are able to determine a booking's creation time to predict the hash and then read that booking's personal data or modify the booking in place.

Affected products

• Unknown Booking Calendar: before 11.8 (fixed in 11.8)

Published 2026-10-08. Last modified 2026-10-08.