The WPBookit plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'WPB_Profile_controller::handle_image_upload' function in versions up to, and including, 1.6.9. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

The WPBookit plugin for WordPress is vulnerable to Arbitrary User Password Change in versions up to, and including, 1.6.4. This is due to the plugin providing user-controlled access to objects, letting a user bypass authorization and access system resources. This makes it possible for unauthenticated attackers to change user passwords and potentially take over administrator accounts.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Iqonic Design WPBookit allows SQL Injection.This issue affects WPBookit: from n/a through 1.6.0.

The Freemius SDK, as used by hundreds of WordPress plugin and theme developers, was vulnerable to Cross-Site Request Forgery and Information disclosure due to missing capability checks and nonce protection on the _get_debug_log, _get_db_option, and the _set_db_option functions in versions up to, and including 2.4.2. Any WordPress plugin or theme running a version of Freemius less than 2.4.3 is vulnerable.

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.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in StylemixThemes Booking Calendar | Appointment Booking | BookIt.This issue affects Booking Calendar | Appointment Booking | BookIt: from n/a through 2.4.3.

The BookIt plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 2.3.7. This is due to insufficient verification on the user being supplied during booking an appointment through the plugin. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the email.

U&M Software JustBookIt 1.0 does not require administrative authentication for all scripts in the admin/ directory, which allows remote attackers to have an unspecified impact via a direct request to (1) user_manual.php, (2) user_config.php, (3) user_kundnamn.php, (4) user_kundlista.php, (5) user_aktiva_kunder.php, (6) database.php, and possibly (7) index.php.

Datalex PLC BookIt! Consumer before 2.2 stores usernames and passwords in plaintext in a cookie, which could allow remote attackers to gain privileges via Cross-site scripting or sniffing attacks.