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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
wphostingdev Pay with Vipps and MobilePay for WooCommerce unaffected
Version Status Constraints
5.0.0 affected < 6.4.1

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Project Subscriptions

Vendors Products
Wphostingdev Subscribe
Pay With Vipps And Mobilepay For Woocommerce Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/changelog.txt cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/woo-vipps/trunk/recurring/includes/wc-vipps-recurring.php cve-icon cve-icon
https://wordpress.org/plugins/woo-vipps/#developers cve-icon cve-icon
https://www.vulncheck.com/advisories/pay-with-vipps-and-mobilepay-for-woocommerce-before-webhook-signature-forgery cve-icon cve-icon
History

Wed, 04 Nov 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 04 Nov 2026 13:15:00 +0000

Type Values Removed Values Added
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.
Title Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery
First Time appeared Wphostingdev
Wphostingdev pay With Vipps And Mobilepay For Woocommerce
Weaknesses CWE-347
CPEs cpe:2.3:a:wphostingdev:pay_with_vipps_and_mobilepay_for_woocommerce:*:*:*:*:*:*:*:*
Vendors & Products Wphostingdev
Wphostingdev pay With Vipps And Mobilepay For Woocommerce
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-04T18:47:15.201Z

Reserved: 2026-11-04T12:58:32.302Z

Link: CVE-2026-121970

cve-icon Vulnrichment

Updated: 2026-11-04T18:47:05.829Z

cve-icon NVD

Status : Received

Published: 2026-11-04T13:17:29.670

Modified: 2026-11-04T19:17:38.700

Link: CVE-2026-121970

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T15:00:19Z

Weaknesses