---
id: CVE-2026-87091
title: >-
  The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via Settlement Notification Parameters in all versions up to, and
  including, 2.12.2 due to insufficient input sanitization and output escaping
summary: >-
  The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via Settlement Notification Parameters in all versions up to, and
  including, 2.12.2 due to insufficient input sanitization and output escaping.
  This…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: uscnanbu
product: Welcart e-Commerce
affected:
  - welcart_e-commerce <= 2.12.2
published: '2026-10-03'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T06:16:44.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87091'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/hoock_func.php#L631
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L569
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L906
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.11.29/functions/settlement_func.php#L951
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/hoock_func.php#L631
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L569
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L906
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/usc-e-shop/tags/2.12.2/functions/settlement_func.php#L951
    label: security@wordfence.com
  - url: 'https://plugins.trac.wordpress.org/changeset/3690880/usc-e-shop'
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3690880/usc-e-shop/trunk/functions/settlement_func.php
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/d6046c06-9a77-450f-9cdf-c5239e73cb6b?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-03T06:39:57.564Z'
---

## Overview

The Welcart e-Commerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Settlement Notification Parameters in all versions up to, and including, 2.12.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The IPN endpoint accepts the 'rel' and 'option' parameters with no authentication, nonce validation, or signature verification, meaning any unauthenticated attacker can directly submit malicious payloads that are stored and later rendered in the administrator's settlement error log view.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.