Vulnerability · Published Oct 8, 2026 · Assigned by WPScan
CVE-2026-105193Booking Calendar < 11.8 - Unauthenticated Booking Information Disclosure and Modification via Predictable Booking Hash
Medium 4.8
In plain English
A medium-severity security flaw in Booking Calendar from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)4.8Medium
Exploit odds (30 days)0.1%top 98.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | Booking Calendar | 0 – before 11.8 |
Weakness: CWE-326 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
References
- https://wpscan.com/vulnerability/c6a81cf3-095d-4d7e-83c5-80f44327e7fe/ exploit, vdb-entry, technical-description