Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/creavi-booking-service/tags/1.1.0/ass
- https://plugins.trac.wordpress.org/browser/creavi-booking-service/trunk/assets/j
- https://plugins.trac.wordpress.org/changeset/3564451/creavi-booking-service
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2618ccde-2bb0-4cd4-b41
FAQ
What is CVE-2026-1856?
CVE-2026-1856 is a vulnerability with a CVSS score of 6.4 (MEDIUM). 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...
How severe is CVE-2026-1856?
CVE-2026-1856 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-1856?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.