The Events Made Easy plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 3.2.5 via the emesingleeventpagetemplate function. This makes it possible for authenticated attackers, with contributor-level access and above, to include and execute arbitrary .php files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where .php file types can be uploaded and included. The stored traversal payload is triggered passively when any visitor loads the affected single-event page, meaning post-submission execution does not require additional attacker interaction.

The Registrations For The Events Calendar plugin for WordPress is vulnerable to SQL Injection via JSON keys in the 'standard' parameter handled by the rtecrecordsedit AJAX action in versions up to and including 3.2. The handler decodes attacker-controlled JSON from $POST['standard'] and uses the JSON array keys directly as column identifiers in the SET clause of an UPDATE statement built inside RTECDbAdmin::updateentry(). Only escsql() (mysqlirealescapestring) is applied to the identifier; that function escapes quotes, backslashes, and a few control characters but does not escape spaces, equals signs, parentheses, or hyphens, so an attacker can break out of the identifier context and inject subqueries (terminated with a SQL comment). This makes it possible for authenticated attackers, with Contributor-level access and above who can edit the targeted event, to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The Events Calendar plugin for WordPress is vulnerable to information disclosure in versions up to, and including, 6.15.9. The sysinfo REST endpoint compares the provided key to the stored opt-in key using a loose comparison, allowing unauthenticated attackers to send a boolean value and obtain the full system report whenever "Yes, automatically share my system information with The Events Calendar support team" setting is enabled.

The Event Tickets, RSVPs, Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'ticketspot' shortcode in all versions up to, and including, 1.0.2 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.

The The Events Calendar plugin for WordPress is vulnerable to time-based SQL Injection via the ‘s’ parameter in all versions up to, and including, 6.15.1 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The Events Calendar WordPress plugin before 6.6.4 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).

The Registrations for the Events Calendar WordPress plugin before 2.13.4 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfilteredhtml capability is disallowed (for example in multisite setup).

The Events Calendar Made Simple – Pie Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's piecal shortcode in all versions up to, and including, 1.2.5 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.

The The Events Calendar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Event Calendar Link Widget through the htmltag attribute in all versions up to, and including, 6.9.0 due to insufficient input sanitization and output escaping. 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.

The Events Calendar WordPress plugin before 6.8.2.1 is missing access checks in the REST API, allowing for unauthenticated users to access information about password protected events.

The Events Calendar WordPress plugin before 6.4.0.1 does not properly sanitize user-submitted content when rendering some views via AJAX.

Improper Validation of Specified Quantity in Input vulnerability in The Events Calendar BookIt allows Manipulating Hidden Fields.This issue affects BookIt: from n/a through 2.4.0.