What the vulnerability does
01Description
The EMC – Easily Embed Calendly Scheduling Features plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's calendly shortcode in all versions up to, and including, 4.4 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.
Explanation of Vulnerability in Simple Terms
02Summary
The EMC plugin for Calendly scheduling contains a stored cross-site scripting (XSS) vulnerability in versions 4.4 and earlier. An authenticated user with low privileges can inject malicious scripts that execute in the browsers of other site visitors, potentially compromising their sessions or stealing sensitive data. The vulnerability affects the entire site scope due to how the plugin processes and displays user input.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers and steal their session data or perform actions on their behalf.
Potential impact on your site
04Site Impact
Visitors and admins may have their sessions hijacked or be redirected to malicious sites; site reputation and user trust at risk.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the site (e.g., subscriber or contributor role).
Key dates
06Disclosure timeline
April 19, 2026
CVE published
April 20, 2026
Record updated
