Bug 2567937 (CVE-2026-63414)

Summary: CVE-2026-63414 shopify_app: shopify_app: Authorization bypass via unverified shop parameter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in shopify_app. In token-exchange authentication workflows, the application can resolve the active store context from an unverified request parameter rather than the validated session token. An authenticated remote attacker with a valid session token for one store can exploit this flaw by submitting requests containing a target store identifier. This may result in authorization bypass, allowing the attacker to access or alter another store's sensitive application data.
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Description OSIDB Bzimport 2026-11-05 22:37:50 UTC 
Shopify App is a Rails engine for building Shopify applications. From 22.1.0 until 23.0.3, `token-exchange` authenticated controllers can expose a request-derived `shop` context instead of the identity from a verified Shopify ID token or active Shopify session. `current_shopify_domain` can resolve to the sanitized `shop` query parameter, so a request authenticated for one `shop` can cause application code to treat a different requested `shop` as current. Affected applications use `shopify_app` `token-exchange` authentication, accept authenticated requests with a `shop` query parameter, and rely on `current_shopify_domain` or `params[:shop]` for authorization, tenant lookup, stored access-token selection or `shop`-scoped data access. An attacker with a valid Shopify session token for one `shop` can supply another `shop` in that parameter and potentially obtain unauthorized application data or perform `shop`-scoped actions, depending on the application's authorization model. This issue is fixed in version 23.0.3.