---
id: CVE-2026-63414
aliases:
  - GHSA-6j52-38f8-qhxr
title: >-
  Shopify App: Token exchange shop context confusion may allow cross-shop
  authorization bypass in affected apps
summary: >-
  Shopify App: Token exchange shop context confusion may allow cross-shop
  authorization bypass in affected apps
severity: high
cwe:
  - CWE-863
vendor: shopify_app
product: shopify_app
ecosystem: rubygems
affected:
  - 'shopify_app >= 22.1.0, < 23.0.3'
patched:
  - shopify_app 23.0.3
published: '2026-10-29'
updated: '2026-10-29'
sourceUpdated: '2026-10-29T16:39:49Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-6j52-38f8-qhxr'
references:
  - url: >-
      https://github.com/Shopify/shopify_app/security/advisories/GHSA-6j52-38f8-qhxr
  - url: 'https://github.com/Shopify/shopify_app/releases/tag/v23.0.3'
  - url: 'https://github.com/advisories/GHSA-6j52-38f8-qhxr'
tags:
  - ghsa
  - rubygems
ingestedAt: '2026-10-29T17:39:38.161Z'
---

## Overview

In token-exchange authenticated controllers, `shopify_app` exposes shop context through helpers such as `current_shopify_domain`. Prior to the fix, `current_shopify_domain` could resolve to the sanitized `shop` query parameter instead of the shop identity derived from the verified Shopify ID token or active Shopify session.

As a result, a request authenticated for one shop could include a different `shop` query parameter, causing application code to treat the requested shop as the current shop.

Applications that used `current_shopify_domain`, or the request `shop` parameter, for authorization decisions, tenant lookup, stored access-token selection, or shop-scoped data access may have been vulnerable to cross-shop context confusion.

The patched version hardens token-exchange handling so that:
   - `current_shopify_domain` resolves to the authenticated shop from the verified token or session.
   - `authenticated_shopify_domain` exposes the trusted authenticated shop.
   - `requested_shopify_domain` exposes the sanitized requested `shop` parameter for bootstrap or routing use cases only.
   - Token-exchange requests are rejected with `401 Unauthorized` when the requested shop does not match the authenticated shop.

## Impact

In affected applications, an attacker with a valid Shopify session token for one shop could send an authenticated request that also supplied a different `shop` query parameter. If the application relied on `current_shopify_domain` or `params[:shop]` for security-sensitive shop scoping, application code could operate in the context of the requested shop rather than the authenticated shop.

Affected applications are those that:

   1. Use `shopify_app` token-exchange authentication;
   2. Accept authenticated controller requests where a `shop` query parameter may be present; and
   3. Use `current_shopify_domain` or the request `shop` parameter for authorization, tenant lookup, stored access-token selection, or shop-scoped resource access.

Depending on the application’s authorization model, this could result in unauthorized access to another shop’s application data or unauthorized shop-scoped actions.

## Remediation
Upgrade to `shopify_app` version `23.0.3`

## Workarounds
Applications that cannot upgrade immediately should apply equivalent validation in token-exchange authenticated controllers:

- Do not use `params[:shop]` for authorization, tenant lookup, access-token selection, or data scoping.
- On vulnerable versions, avoid relying on `current_shopify_domain` for security-sensitive shop scoping if a `shop` query parameter may be present.
- Use the authenticated shop from the verified ID token or active Shopify session instead, such as `current_shopify_session.shop` or the verified JWT `dest` value.
   - If a sanitized `params[:shop]` value is present, reject the request with `401 Unauthorized` when it does not match the authenticated shop.

## Credit

This issue was responsibly reported by Hackerone researcher [leqtuer](https://hackerone.com/leqtuer?type=user).

## Affected packages

- `shopify_app >= 22.1.0, < 23.0.3`

## Remediation

Upgrade to a patched release:

- `shopify_app 23.0.3`