What is CVE-2020-8176?

CVE-2020-8176 is a medium-severity vulnerability in Shopify Koa-Shopify-Auth, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-07-02.

How severe is CVE-2020-8176?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Shopify Koa-Shopify-Auth

CVE-2020-8176

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-07-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Shopify Koa-Shopify-Auth — versions 3.1.61, 3.1.62
Koa-Shopify-Auth — versions Impacted: v3.1.61-v3.1.62, Fixed: v3.1.63

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/Shopify/quilt/pull/1455 (Exploit, Patch, Third Party Advisory)
hackerone.com/reports/881409 (Permissions Required)

Frequently asked questions

What is CVE-2020-8176?: CVE-2020-8176 is a medium-severity vulnerability in Shopify Koa-Shopify-Auth, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-07-02.
How severe is CVE-2020-8176?: Medium severity. CVSS v3 base score is 6.1 out of 10.