Is Customer Email Verification for WooCommerce safe? Known vulnerabilities and latest version

The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Privilege Escalation via the `alg_wc_ev_verify_email` parameter in versions up to, and including, 3.3.0. The vulnerability exists because `alg_wc_ev_generate_user_code()` generates the per-user activation secret using `wp_rand(100)` when the plugin's 'Encoding method' is set to 'hashids', producing only ~101 possible values (~7 bits of entropy); the resulting token is a reversible Hashids encoding with no cryptographic MAC, and the unauthenticated `verify()` handler — hooked to `init` at `PHP_INT_MAX` with no nonce check and no rate limiting — accepts and acts on the attacker-controlled `?alg_wc_ev_verify_email=` GET parameter directly. This makes it possible for unauthenticated attackers to gain authentication as any unverified WordPress account, including administrator-level accounts, by brute-forcing the trivially small activation code space via a forged verification URL. Exploitation requires that the 'Encoding method' setting be changed to 'hashids' (non-default), that the attacker recover or brute-force the Hashids salt (which defaults to an `md5(time())` value set at first initialization), and that the target account's email address remain unverified.

The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 2.9.4 via Shortcode. This makes it possible for authenticated attackers, with Contributor-level access and above, to extract sensitive data including emails as well as hashed passwords of any user.

The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.9.5. This is due to the presence of a shortcode that will generate a confirmation link with a placeholder email. This makes it possible for authenticated attackers, with Contributor-level access and above, to generate a verification link for any unverified user and log into the account. The 'Fine tune placement' option must be enabled in the plugin settings in order to exploit the vulnerability.

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in WPFactory Email Verification for WooCommerce emails-verification-for-woocommerce allows SQL Injection.This issue affects Email Verification for WooCommerce: from n/a through <= 2.8.10.

The Customer Email Verification for WooCommerce plugin for WordPress is vulnerable to Email Verification and Authentication Bypass in all versions up to, and including, 2.7.4 via the use of insufficiently random activation code. This makes it possible for unauthenticated attackers to bypass the email verification, and if both the "Login the user automatically after the account is verified" and "Verify account for current users" options are checked, then it potentially makes it possible for attackers to bypass authentication for other users.