Easy Appointments <= 3.11.18 - Authenticated (Contributor+) Stored Cross-Site Scripting

Vulnerability Description

The Easy Appointments plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'ea_full_calendar' shortcode in all versions up to, and including, 3.11.18 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/9e1514c8-3752-4d0a-87a3-3f245a7cb914?source=cve
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3059359%40easy-appointments&new=3059359%40easy-appointments&sfp_email=&sfph_mail=