The EMC – Easily Embed Calendly Scheduling WordPress plugin suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input in the calendly shortcode. This allows authenticated users with contributor or higher privileges to inject malicious scripts into pages, which execute upon page access by other users. The vulnerability affects all plugin versions up to 4.4. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity with no impact on availability. No patch or official remediation has been published, and no known exploits have been reported.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the plugin's calendly shortcode. These scripts execute in the context of users viewing the affected pages, potentially leading to unauthorized actions or data disclosure limited to the confidentiality and integrity impacts described. There is no reported impact on system availability. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the plugin if possible to prevent exploitation. Monitor vendor communications for updates regarding patches or mitigations.