WPFunnels applies funnel discounts to attacker-selected products

WPFunnels through 3.12.13 exposes wpfnl_load_payment to unauthenticated callers. add_offer_product_to_cart() checks neither nonce nor capability and does not ensure product_id matches the offer configured for step_id. An attacker can combine a chosen WooCommerce product with another funnel step's discount, reducing its checkout price.

CVE / CNA score 5.3 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: WPFunnels – Funnel Builder for WooCommerce with Checkout & One Click Upsell
Plugin slug: wpfunnels
Affected: <= 3.12.13
Safe version: 3.13.0
Published: Sep 09, 2026
Weakness: CWE-862 — Missing Authorization

This CVE was published Sep 09, 2026 and is one of 23 known issues for this plugin.

What to do

Update, patch or deactivate.

Update WPFunnels to 3.13.0 or later. The official changelog identifies the matching fix.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The WPFunnels plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 3.12.13. This is due to the plugin registering the 'wpfnl_load_payment' AJAX action for both authenticated and unauthenticated (wp_ajax_nopriv_) users and the underlying add_offer_product_to_cart() function performing no nonce verification, no capability check, and no validation that the attacker-supplied product_id is the offer product actually configured on the attacker-supplied step_id. This makes it possible for unauthenticated attackers to add arbitrary WooCommerce products to a cart at any discounted price configured on any funnel step, enabling price manipulation and revenue loss at checkout.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Primary and upstream sources

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