Security fix: prevent unauthenticated arbitrary list subscription (2.…#223
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oleksandr-mykhailenko merged 2 commits intoJul 9, 2026
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…2.1) Add nonce verification and server-side list address allowlist validation to the add_list AJAX action. Previously the nopriv action accepted any list address and email without authentication or CSRF protection, allowing an unauthenticated attacker to enrol arbitrary addresses into the site owner's Mailgun lists using stored API credentials as a confused deputy. Reported by Pedro Pinho. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Documents five changes that shipped in 2.2.0 but had no changelog coverage: domain-part URL fix, key- prefix removal, PHP 8.4 nullable type hints, swapped tracking labels fix, and WordPress 7.0 compatibility. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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…2.1)
Add nonce verification and server-side list address allowlist validation to the add_list AJAX action. Previously the nopriv action accepted any list address and email without authentication or CSRF protection, allowing an unauthenticated attacker to enrol arbitrary addresses into the site owner's Mailgun lists using stored API credentials as a confused deputy. Reported by Pedro Pinho.