CVE-2026-1856CWE-79

Appointment Booking Calendar <= 1.4.4 - Authenticated (Author+) Stored Cross-Site Scripting via Custom Booking Field Label

Medium · published June 19, 2026

CVSS v3.1
6.4
EPSS
0%
Percentile
25.1
In the wild
Unconfirmed
What it is

The Appointment Booking Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via custom booking field labels in all versions up to, and including, 1.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The record
Technical detail
CVSS v3.1
6.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00331 · 25.1th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-19T04:31Z
EPSS history
Timeline
  • 19 JUN 04:31Z
    Appointment Booking Calendar <= 1.4.4 - Authenticated (Author+) Stored Cross-Site Scripting via Custom Booking Field Label
    cvelistv5