CVE-2026-17520

The WordPress plugin Newsletters (newsletters-lite) up to version 4.18.1 contains a deserialization of untrusted data vulnerability, allowing object injection. This could enable an attacker to execute unintended code.

The WordPress plugin Newsletters (newsletters-lite) up to version 4.18.1 is vulnerable to SQL injection due to improper neutralization of special elements in SQL commands. This could allow an attacker to execute arbitrary SQL queries.

The Newsletters plugin for WordPress in versions up to and including 4.18.1 is vulnerable to time-based SQL Injection via the 'id' parameter due to insufficient escaping of user-supplied input and lack of proper preparation of the existing SQL query. An authenticated attacker with subscriber-level access or higher can append additional SQL queries to existing queries to extract sensitive information from the database. An attacker can obtain the required nonce and subscriberauth cookie without a WordPress account by subscribing through the public newsletter form and opening the management link sent via email; the ownership check verifies only the subscriber_id field and does not validate that the injected id parameter belongs to the authenticated subscriber.

The WordPress plugin Newsletters in versions up to 4.18 contains an SQL Injection vulnerability accessible to users with administrator privileges. An administrator can inject malicious SQL queries through a vulnerable parameter.

The Newsletters WordPress plugin before version 4.17 does not perform any nonce or capability check when saving one of its settings screens, and writes every submitted parameter into its own options. This allows attackers to make a logged-in administrator overwrite arbitrary plugin settings, including the credential protecting its API, via a Cross-Site Request Forgery attack.

The Newsletters plugin for WordPress up to version 4.17 is vulnerable to authorization bypass. Authenticated attackers with author-level access and above can send arbitrary newsletter emails to users of any WordPress role, including administrators, by forging POST fields during a normal post submission. The attacker can supply a role slug via the newsletters_mailinglistsroles POST field, enabling unauthorized mass-mailing and potential phishing.

The Newsletters WordPress plugin before version 4.16 does not strictly compare its API authentication key, allowing unauthenticated attackers to bypass the API authentication via type juggling and perform privileged actions such as modifying subscriber records and sending emails, when the optional API has been enabled.

The Newsletters WordPress plugin before version 4.16 does not restrict the classes allowed when unserialising a value taken from a public form submission, allowing unauthenticated attackers to inject arbitrary PHP objects.

The Newsletters plugin for WordPress (versions up to 4.14) is vulnerable to reflected XSS. Improper input neutralization during web page generation allows injection of malicious scripts.

The Newsletters plugin for WordPress up to version 4.13 is vulnerable to time-based SQL injection via the 'wpmlsubscriber_id' parameter. Insufficient escaping and lack of proper SQL query preparation allow unauthenticated attackers to append additional SQL queries, potentially extracting sensitive information from the database.