CVE-2026-56292

The AcyMailing plugin for WordPress in versions up to and including 11.1.0 is vulnerable to Stored Cross-Site Scripting via the customField[] parameter of the public frontusers::subscribe endpoint. The acym_cleanVar() sanitizer only strips complete HTML tags, and SubscriberInsertion::replaceUserInformation() together with the archive view template insert the stored subscriber field value into the mail body without HTML encoding. This allows an unauthenticated attacker to inject arbitrary scripts that execute when the online-archive URL for the poisoned subscriber is accessed.

The AcyMailing plugin for WordPress is vulnerable to Directory Traversal in all versions up to, and including, 11.0.4 via the `user[name]` parameter. This allows unauthenticated attackers to read arbitrary files on the server. Exploitation requires the "Embed images" option to be enabled.

The AcyMailing plugin for WordPress up to version 10.11.1 has an authorization bypass vulnerability. An authenticated attacker with subscriber-level access can overwrite the BCC field of the acy_notification_cms notification template, causing WordPress password reset emails, including those for administrators, to be silently copied to an attacker-controlled address, enabling account takeover.

The AcyMailing plugin for WordPress up to version 10.10.2 is vulnerable to Stored Cross-Site Scripting via the 'alignment' attribute due to insufficient input sanitization and output escaping. Authenticated attackers with contributor-level access or higher can inject arbitrary web scripts that execute whenever a user accesses an injected page.