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MEDIUM severity

Cross-site scripting in @shopify/koa-shopify-authGHSA-jqh7-w5pr-cr56

MEDIUMFix: Shopify/quilt#1455

GHSA-jqh7-w5pr-cr56 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in @shopify/koa-shopify-auth. 1 public exploit reference exists, so weaponization risk is real. A fix is available for @shopify/koa-shopify-auth — see the affected versions and patch details below.

Also known asCVE-2020-8176
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.49%0.99%1.48%0.2%1.0%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-jqh7-w5pr-cr56 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.

@shopify/koa-shopify-authnpm
1Kdownloads / week

Description

A cross-site scripting vulnerability exists in koa-shopify-auth v3.1.61-v3.1.62 that allows an attacker to inject JS payloads into the shop parameter on the /shopify/auth/enable_cookies endpoint.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@shopify/koa-shopify-auth≥ 3.1.61&&< 3.1.633.1.63npm install @shopify/koa-shopify-auth@3.1.63

Affected Products

1 product · 2 configurations
Application
koa-shopify-authshopify
2 versions
3.1.613.1.62
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

A cross-site scripting vulnerability exists in koa-shopify-auth v3.1.61-…

github.comNVDJul 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @shopify/koa-shopify-auth, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @shopify/koa-shopify-auth to 3.1.63 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-jqh7-w5pr-cr56 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

A cross-site scripting vulnerability exists in koa-shopify-auth v3.1.61-v3.1.62 that allows an attacker to inject JS payloads into the `shop` parameter on the `/shopify/auth/enable_cookies` endpoint.
O3 Security · Impact-Aware SCA

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Cross-site scripting in @shopify/koa-shopify-auth