What the vulnerability does
01Description
The Appointmind plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'appointmind_calendar' shortcode in all versions up to, and including, 4.1.0 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
Appointmind versions up to 4.1.0 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users. The vulnerability has a changed scope, meaning the impact extends beyond the vulnerable component itself. Low-privileged users can exploit this without requiring victim interaction.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect the application's functionality.
Potential impact on your site
04Site Impact
Users' sessions and data could be compromised through script injection; site functionality may be disrupted.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account on the Appointmind installation.
Key dates
06Disclosure timeline
September 17, 2025
CVE published
April 8, 2026
Record updated
