CVE-2026-121970 Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121970?
CVE-2026-121970 is a medium-severity vulnerability in wphostingdev Pay with Vipps and MobilePay for WooCommerce, published on 4 Nov 2026.
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.
Weakness: CWE-347
Which versions are affected by CVE-2026-121970?
How do I fix CVE-2026-121970?
No fix has been published for CVE-2026-121970 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121970 being exploited?
There is no known exploitation of CVE-2026-121970 in the wild and no public exploit code.
Sources
Also known as GHSA-x965-w74v-3qc3.