What’s Vulnerable › Vulnerabilities
CVE-2026-111110: Payment forms, Buy now buttons, and Invoicing System | GetPaid <= 2.8.61 - Unauthenticated Stored Cross-Site Scripting via 'mmdwqzpoxadd' Parameter
- Severity: high (CVSS 7.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-17 · updated 2026-10-19
- Weakness: CWE-79
Description
The Payment forms, Buy now buttons, and Invoicing System | GetPaid plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'mmdwqzpoxadd' parameter in all versions up to, and including, 2.8.61 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The required nonce (getpaid_form_nonce) is publicly emitted to all visitors via wp_localize_script as WPInv.formNonce, meaning no authentication or prior nonce leak is needed; the stored payload fires when an administrator views the affected invoice's Payment Form Details metabox.
Affected products
References
- https://github.com/AyeCode/invoicing/archive/refs/heads/master.zip
- https://plugins.trac.wordpress.org/browser/invoicing/tags/2.8.61/includes/admin/meta-boxes/class-mb-payment-form.php#L30
- https://plugins.trac.wordpress.org/browser/invoicing/tags/2.8.61/includes/class-wpinv-ajax.php#L359
- https://plugins.trac.wordpress.org/browser/invoicing/tags/2.8.61/includes/payments/class-getpaid-checkout.php#L293
- https://plugins.trac.wordpress.org/browser/invoicing/tags/2.8.61/includes/payments/class-getpaid-checkout.php#L402
- https://plugins.trac.wordpress.org/browser/invoicing/tags/2.8.61/includes/payments/class-getpaid-payment-form-submission.php#L150
- https://plugins.trac.wordpress.org/changeset/3750463/invoicing/trunk/includes/admin/meta-boxes/class-mb-payment-form.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2161ecdc-d3c2-4ede-9c42-28f30fa0f91e?source=cve
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