---
id: "CVE-2026-128043"
page: "https://infrastack.ai/live/CVE-2026-128043"
kind: "vulnerability"
aliases: ["CVE-2026-128043"]
title: "OpenMage magento-lts: PayPal cancel handler lets attackers cancel shoppers' orders"
severity: "low"
cvss: 3.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["e-commerce", "magento-lts", "openmage", "package", "paypal", "php"]
not_affected_if: ["fixed-version", "no-paypal-standard"]
published_at: "2026-11-13T10:18:09+00:00"
first_seen_at: "2026-11-13T10:47:32+00:00"
updated_at: "2026-11-13T10:58:57+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-128043", "first_seen_at": "2026-11-13T10:47:32+00:00"}]
exploit_sources: []
---

# OpenMage magento-lts: PayPal cancel handler lets attackers cancel shoppers' orders

Link for people: https://infrastack.ai/live/CVE-2026-128043 (this .md is for agents)

OpenMage magento-lts has a cross-site request forgery flaw in its PayPal cancel and decline return handlers, which trust the checkout session without checking the request came from PayPal. An attacker who lures a shopper to a crafted link can cancel the shopper's recent uninvoiced order, void pending authorizations, and restore items to the cart.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed magento-lts version in composer.json or the OpenMage package lock file, and compare it with the fixed versions below.
- Look for the PayPal Standard module enabled in the store configuration (unknown whether a specific setting is required).

## Fix

- magento-lts: upgrade to `20.19.0` or later on the 20.x line
- magento-lts 21.x beta: upgrade to `21.0.0-beta3` or later

## Timeline

- 2026-11-13T10:47:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-128043

## Documents

- [advisory] Vendor advisory: github.com https://github.com/OpenMage/magento-lts/security/advisories/GHSA-2jfg-wx75-5cc8
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/openmage-magento-lts-before-20.19.0-csrf-via-paypal-cancel-return-handlers
- [fix] Patch: github.com https://github.com/OpenMage/magento-lts/commit/86c8895d586db61ac7d093ba4e473103a30882c8

## From the sources

OpenMage magento-lts before 20.19.0 and 21.0.0-beta1 before 21.0.0-beta3 contains a cross-site request forgery vulnerability in PayPal cancel and decline return handlers that trust only the checkout session without verifying the request came from PayPal. Attackers can lure a shopper into a cross-site GET to paypal/standard/cancel to cancel their recent uninvoiced order, void pending authorizations, and restore items to the cart.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_