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

published 2020-07-02 6 y ago modified 2026-06-17 4 mo ago also GHSA-jqh7-w5pr-cr56 , EUVD-2021-1124

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 1

npm @shopify/koa-shopify-auth 3.1.63

github.com/Shopify/quilt#1455 pull request

Exploit prediction

0.98% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/Shopify/quilt/pull/1455 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	@shopify/koa-shopify-auth	>=3.1.61, <3.1.63	3.1.63

Affected products

n/a koa-shopify-auth

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /Shopify/quilt/pull/1455
web, exploit, patch, third-party-advisory
hackerone.com /reports/881409
web, permissions-required
nvd.nist.gov /vuln/detail/CVE-2020-8176
advisory

Sources

CVE List CVE-2020-8176
GitHub Advisory GHSA-jqh7-w5pr-cr56
NVD CVE-2020-8176

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary