CVE-2026-0656Network attack vector

Unauthenticated payment bypass via unsigned webhooks

Published Jan 7, 2026 · Updated Jan 7, 2026

Missing authentication in iPaymu Payment Gateway for WooCommerce 2.0.2 and earlier allows remote attackers to falsify paid orders. The check_ipaymu_response function accepts webhook GET and POST data without verifying a signature or request origin, enabling order-key enumeration and payment-status updates. No account or completed payment is required; crafted requests can expose customer order details or mark an order paid.

CVSS severity8.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in iPaymu Payment Gateway for WooCommerce 2.0.2 and earlier allows remote attackers to falsify paid orders. The check_ipaymu_response function accepts webhook GET and POST data without verifying a signature or request origin, enabling order-key enumeration and payment-status updates. No account or completed payment is required; crafted requests can expose customer order details or mark an order paid.

The record

CVE
CVE-2026-0656
Published
Jan 7, 2026
Updated
Jan 7, 2026
Vendor
iPaymu
Product
iPaymu Payment Gateway for WooCommerce
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=2.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

iPaymu · iPaymu Payment Gateway for WooCommerceversion=* <=2.0.2

Published CVSS scores

8.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo