CVE-2026-121970
Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Pay with Vipps and MobilePay for WooCommerce wphostingdev |
≥ 5.0.0; < 6.4.1 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.3 medium |
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 3.7 low |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://wordpress.org/plugins/woo-vipps/#developersCNA: VulnCheck · patch, release-notes
- https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/changelog.txtCNA: VulnCheck
- https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/includes/wc-vipps-recurring.phpCNA: VulnCheck
- https://www.vulncheck.com/advisories/pay-with-vipps-and-mobilepay-for-woocommerce-before-webhook-signature-forgeryCNA: VulnCheck · third-party-advisory
For agents and automation
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Endpoints and access details
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A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
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