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Response snapshot Oct 29, 2026, 18:26 UTC

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VulnerabilityCVE-2026-63414

Shopify App: Token exchange shop context confusion may allow cross-shop authorization bypass in affected apps

In token-exchange authenticated controllers, shopify_app exposes shop context through helpers such as current_shopify_domain.

At a glance

Exploited
Not known
Severity
7.6 High (CVSS 4.0)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: shopify_app: 23.0.3. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-6j52-38f8-qhxr (opens a new tab)

What happened

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.

Continue reading

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 package ranges reported by GitHub: shopify_app: >= 22.1.0, < 23.0.3

Scores and how they were measured

CVSS base severity

7.6

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-6j52-38f8-qhxr (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-6j52-38f8-qhxr, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 29). Shopify App: Token exchange shop context confusion may allow cross-shop authorization bypass in affected apps (CVE-2026-63414). https://kevwire.com/record/CVE-2026-63414

MLA

"Shopify App: Token exchange shop context confusion may allow cross-shop authorization bypass in affected apps (CVE-2026-63414)." KEVWire, 29 Oct. 2026, kevwire.com/record/CVE-2026-63414.

Chicago

KEVWire. "Shopify App: Token exchange shop context confusion may allow cross-shop authorization bypass in affected apps (CVE-2026-63414)." Last modified October 29, 2026. https://kevwire.com/record/CVE-2026-63414.

Evidence summary (plain text)

Shopify App: Token exchange shop context confusion may allow cross-shop authorization bypass in affected apps (Oct 29, 2026).
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.
CVSS 7.6 (version 4.0; evidence as of Oct 29, 2026; https://github.com/advisories/GHSA-6j52-38f8-qhxr).
Sources:
GitHub-reviewed advisory GHSA-6j52-38f8-qhxr: https://github.com/advisories/GHSA-6j52-38f8-qhxr
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-63414.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 29, 2026, 18:26 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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