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CVE-2026-12493 – Payment Verification Bypass – Clover Payment Gateway by Zaytech for WooCommerce …

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Summary

CVE-2026-12493 is a high-severity unauthenticated payment verification bypass affecting the Clover Payment Gateway by Zaytech for WooCommerce WordPress plugin in all versions before 1.3.6. The flaw allows any unauthenticated attacker to mark arbitrary WooCommerce orders as paid by replaying a legitimately-approved payment reference — without paying the correct amount. It carries a CVSS v3.1 base score of 7.5 (High).

Technical details

  • Root cause: The plugin’s check_order handler does not verify that an approved external payment record belongs to the specific WooCommerce order being completed, nor does it validate that the paid amount matches the order total (CWE-287: Improper Authentication).
  • Trigger conditions: An attacker need only complete a single legitimate — potentially minimal-value — purchase through the plugin to obtain a genuine payment reference. No account privilege or administrator interaction is required beyond that initial transaction.
  • Attack vector: Fully remote and unauthenticated. The attacker replays the approved payment reference against arbitrary target orders via a crafted network request to the vulnerable callback endpoint, causing the store to record those orders as paid.
  • Impact: Integrity impact only. Successful exploitation allows an attacker to fraudulently obtain goods or services for any order on the affected store without paying the correct amount, causing direct financial loss to merchants.

Affected software

  • Clover Payment Gateway by Zaytech for WooCommerce — all versions before 1.3.6

Severity

  • CVSS v3.1 Base Score: 7.5 (High)
  • Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: Update the Clover Payment Gateway by Zaytech for WooCommerce plugin to version 1.3.6 or later, which contains the vendor-issued fix for order status handling and payment processing verification. The patched version is available directly from the WordPress plugin repository.
  • If immediate patching is not possible: Temporarily disable the Clover payment gateway within WooCommerce settings to prevent checkout transactions from being processed through the vulnerable code path until the update can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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