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.

The WP 2FA with Telegram plugin for WordPress is vulnerable to Two-Factor Authentication Bypass in versions up to, and including, 3.0. This is due to the two-factor code being stored in a cookie, which makes it possible to bypass two-factor authentication.

The WP 2FA with Telegram plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 3.0. This is due to insufficient validation of the user-controlled key on the 'validate_tg' action. This makes it possible for authenticated attackers, with subscriber-level permissions and above, to log in as any existing user on the site, such as an administrator.

Insertion of Sensitive Information into Log File vulnerability in WP 2FA allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects WP 2FA: from n/a through 2.6.3.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Melapress WP 2FA allows Reflected XSS.This issue affects WP 2FA: from n/a through 2.6.2.

Improper Authentication vulnerability in Melapress WP 2FA allows Authentication Bypass.This issue affects WP 2FA: from n/a through 2.2.0.

The WP 2FA – Two-factor authentication for WordPress plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.5.0. This is due to missing or incorrect nonce validation on the send_backup_codes_email function. This makes it possible for unauthenticated attackers to send emails with arbitrary content to registered users via a forged request granted they can trick a site administrator or other registered user into performing an action such as clicking on a link. While a nonce check is present, it is only executed if a nonce is set. By omitting a nonce from the request, the check can be bypassed.

The WP 2FA – Two-factor authentication for WordPress plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 2.5.0 via the send_backup_codes_email due to missing validation on a user controlled key. This makes it possible for subscriber-level attackers to email arbitrary users on the site.

The WP 2FA WordPress plugin before 2.3.0 uses comparison operators that don't mitigate time-based attacks, which could be abused to leak information about the authentication codes being compared.

The WP 2FA WordPress plugin before 2.2.1 does not sanitise and escape a parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting