Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck
CVE-2026-121970Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery
Low 3.7
In plain English
A low-severity security flaw in Pay with Vipps and MobilePay for WooCommerce from wphostingdev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 8% of all known vulnerabilities).
Official description
Pay with Vipps and MobilePay for WooCommerce (woo-vipps) before 6.4.1 contains an improper cryptographic signature verification vulnerability in the recurring-payment webhook handler that allows unauthenticated attackers to forge webhook requests when no local webhook secret is stored, because the code fails to return on an empty secret and computes an HMAC keyed with an empty string using a loose == comparison instead of hash_equals. Attackers can craft a recurring.agreement-stopped.v1 event with a known agreementId and a matching empty-key signature to cancel a victim's active WooCommerce subscription.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| wphostingdev | Pay with Vipps and MobilePay for WooCommerce | 5.0.0 – before 6.4.1 |
Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- Vendor Patch patch, release-notes
- https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/changelog.txt
- https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/includes/wc-vipps-recurring.php
- VulnCheck Advisory: Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery third-party-advisory