What is CVE-2026-105193?

CVE-2026-105193 is a medium-severity vulnerability in Booking Calendar, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2026-10-08.

How severe is CVE-2026-105193?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Vulnerability in Booking Calendar

CVE-2026-105193

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.

Published 2026-10-08 · last modified 2026-10-08.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Booking Calendar

Weakness classification (CWE)

CWE-326 — Inadequate Encryption Strength

References

wpscan.com/vulnerability/c6a81cf3-095d-4d7e-83c5-80f44327e7fe/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-105193?: CVE-2026-105193 is a medium-severity vulnerability in Booking Calendar, classified under Inadequate Encryption Strength. CVSS score: 4.8/10. Published 2026-10-08.
How severe is CVE-2026-105193?: Medium severity. CVSS v3 base score is 4.8 out of 10.