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CVE-2026-121970— Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery

Quick assessment

Affected
wphostingdev Pay with Vipps and MobilePay for WooCommerce
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WooCommerce 的"Pay with Vipps and MobilePay"插件（woo-vipps）在 6.4.1 版本之前存在一个不正确的加密签名验证漏洞。该漏洞位于周期性支付的 Webhook 处理器中：若未存储本地 Webhook 密钥，未经验证的攻击者即可伪造 Webhook 请求。原因在于代码在密钥为空时未执行返回操作，而是使用空字符串作为密钥计算 HMAC，并采用宽松的 比较而非安全的 函数进行验证。攻击者可构造一个包含已知 且带有匹配空密钥签名的 事件，从而取消受害者正在使用的 WooCo

CVSS 3.7 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
wphostingdev Pay with Vipps and MobilePay for WooCommerce 5.0.0< 6.4.1 affected
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I. Basic Information for CVE-2026-121970

Vulnerability Information
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Vulnerability Title
Pay with Vipps and MobilePay for WooCommerce before 6.4.1 Webhook Signature Forgery
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wphostingdev Pay with Vipps and MobilePay for WooCommerce 5.0.0 ~ 6.4.1 -

II. Public POCs for CVE-2026-121970

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III. Intelligence Information for CVE-2026-121970

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Other References for CVE-2026-121970 (4)

IV. Related Vulnerabilities

Same product: Pay with Vipps and MobilePay for WooCommerce
Same vendor: wphostingdev
Same weakness: CWE-347