CVE-2026-9021

Vulnerability Description

The Easy Invoice plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 2.1.19. This is due to the plugin registering the easy_invoice_accept_quote and easy_invoice_decline_quote AJAX actions via wp_ajax_nopriv_ hooks and relying solely on a quote-scoped nonce that is rendered into the publicly accessible single quote template, combined with an ownership check that is gated behind an off-by-default Pro option (easy_invoice_pro_restrict_quote_to_client). This makes it possible for unauthenticated attackers to accept or decline arbitrary published quotes — and, depending on the configured accept action, automatically convert them into invoices (and even email them to the client) — by harvesting the per-quote nonce from the public quote page and submitting it to admin-ajax.

CVSS Score

Related Weaknesses (CWE)

References

• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Con
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Con
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Con
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/templates/qu
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Cont
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Cont
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Cont
• https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/templates/quo
• https://plugins.trac.wordpress.org/changeset/3517910/easy-invoice/trunk/includes
• https://www.wordfence.com/threat-intel/vulnerabilities/id/dab1c93d-e83c-4d38-be8