Missing authorization in MatrixAddons Easy Invoice – Invoice Generator, PDF Quotes &…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MatrixAddons | Easy Invoice – Invoice Generator, PDF Quotes & Payments | up to 2.2.19 | — | No fix listed | CNA |
- Easy Invoice – Invoice Generator, PDF Quotes & Payments VendorMatrixAddons Affected up to 2.2.19 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9021
- 2026-10-03 Alias added: GHSA-q2rr-fm39-2rpw
References
Other 10
- 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
More MatrixAddons vulnerabilities
- TI-2025-40640 WordPress Easy Invoice plugin <= 2.1.4 - Local File Inclusion vulnerability CVSS 3.1MEDIUM 6.6
- TI-2026-47344 WordPress Easy Invoice plugin <= 2.3.8 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
- TI-2025-05725 WordPress Easy Invoice plugin <= 2.0.9 - Cross Site Scripting (XSS) vulnerability CVSS 3.1HIGH 7.1
- TI-2025-36308 WordPress Document Engine Plugin <= 1.2 - Cross Site Scripting (XSS) Vulnerability CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-9021 · CVE Program
- CVE-2026-9021 · NVD
- FIRST EPSS
- GHSA-q2rr-fm39-2rpw · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences