# CVE-2026-63414: Shopify shopify_app token-exchange shop context confusion

Source: https://junglewise.ai/threats/cve-2026-63414-shopify-app-token-exchange-shop-context-confusion-may-allow-cross  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-30. Updated: 2026-10-29  
License: CC BY 4.0 with a link back

CVE-2026-63414 · Severity: high · CVSS 4 · Published 2026-10-30

Shopify's shopify_app library is used to authenticate applications that access Shopify stores. A flaw in token-exchange authentication allows an attacker with a valid session for one store to trick the application into operating in the context of a different store, potentially granting unauthorized access to that store's data or enabling unauthorized actions.

Vendors: [RubyGems](https://junglewise.ai/threats/vendors/rubygems), [Shopify](https://junglewise.ai/threats/vendors/shopify).

## Quick answers

**Is CVE-2026-63414 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63414 being exploited in the wild.

**How severe is CVE-2026-63414?** High severity, with a CVSS score of 4, published 30 October 2026.

**Which products and versions are affected?** shopify_app (RubyGems) >= 22.1.0, < 23.0.3, ECOSYSTEM:introduced=22.1.0,fixed=23.0.3; Shopify App before 23.0.3.

**Is there a fix for CVE-2026-63414?** Yes. shopify_app (RubyGems): upgrade to 23.0.3 or later. Until then: Applications unable to upgrade should validate in token-exchange authenticated controllers: do not use `params[:shop]` for authorization or data scoping; use the authenticated shop from the verified ID token or session (`current_shopify_session.shop` or JWT `dest` value); and reject requests with `401 Unauthorized` if a `shop` query parameter does not match the authenticated shop. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63414 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-63414?** Check whether you run shopify_app (RubyGems) or Shopify App at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- shopify_app (RubyGems): upgrade to 23.0.3 or later

  ```sh
  bundle update shopify_app
  ```


Applications unable to upgrade should validate in token-exchange authenticated controllers: do not use `params[:shop]` for authorization or data scoping; use the authenticated shop from the verified ID token or session (`current_shopify_session.shop` or JWT `dest` value); and reject requests with `401 Unauthorized` if a `shop` query parameter does not match the authenticated shop.

## Technical details

The vulnerability exists in token-exchange authenticated controllers where `current_shopify_domain` could incorrectly resolve to a sanitized `shop` query parameter instead of the authenticated shop identity from the verified ID token or session. An attacker with a valid token for shop A can submit a request with a different `shop` query parameter for shop B, and if the application uses `current_shopify_domain` or `params[:shop]` for authorization or tenant decisions, it will operate in shop B's context. The patch ensures `current_shopify_domain` resolves to the authenticated shop, introduces `authenticated_shopify_domain` for the trusted shop, and rejects mismatched shop parameters with 401 Unauthorized.

## Affected products

- Shopify shopify_app before 23.0.3

## Identifiers

- CVE-2026-63414
- GHSA-6j52-38f8-qhxr

## Timeline

- 2026-10-29: disclosed