PT-2026-50840 · WordPress · Appointment Booking Calendar

Athiwat Tiprasaharn + 1 · CVE-2026-1856 · Published 2026-06-19 · Updated 2026-06-22

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Appointment Booking Calendar versions prior to 1.4.5

Description The Appointment Booking Calendar plugin for WordPress contains a Stored Cross-Site Scripting issue caused by insufficient input sanitization and output escaping in custom booking field labels. Authenticated attackers with Author-level access or higher can inject arbitrary web scripts into pages, which then execute when a user visits the affected page.

Recommendations Update to a version later than 1.4.4.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-1856

Affected Products

Appointment Booking Calendar

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2026-1856 · Security Note
• https://t.me/CVEtracker/57332 · Telegram Post
• https://plugins.trac.wordpress.org/browser/creavi-booking-service/trunk/assets/js/booking.js#L379 · Note
• https://twitter.com/infoflowcloud/status/2067934593580237297 · Twitter Post
• https://plugins.trac.wordpress.org/changeset/3564451/creavi-booking-service · Note
• https://t.me/cveNotify/171594 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2067880947907768449 · Twitter Post
• https://t.me/cveNotify/170907 · Telegram Post
• https://plugins.trac.wordpress.org/browser/creavi-booking-service/tags/1.1.0/assets/js/booking.js#L379 · Note
• https://twitter.com/CVEnew/status/2067932726242734142 · Twitter Post
• https://wordfence.com/threat-intel/vulnerabilities/id/2618ccde-2bb0-4cd4-b415-68a671507709?source=cve · Note