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Vulnerability record · CVE-2020-4038 · published 8 June 2020

CVE-2020-4038: Prisma graphql-playground-html cross-site scripting vulnerability

Prisma · Graphql Playground Html

GraphQL Playground (graphql-playground-html NPM package) before version 1.6.22 have a severe XSS Reflection attack vulnerability. All unsanitized user input passed into renderPlaygroundPage() method could trigger this vulnerability. This has been patched in graphql-playground-html version 1.6.22. Note that some of the associated dependent middleware packages are also affected including but not limited to graphql-playground-middleware-express before version 1.7.16, graphql-playground-middleware-koa before version 1.6.15, graphql-playground-middleware-lambda before version 1.7.17, and graphql-playground-middleware-hapi before 1.6.13.

7.4 CVSS 3.1 High EPSS 7.2% · top 5.9% CWE-79 · Cross-site scripting
7.4CVSS 3.1 base score, v2 4.3
7.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

GraphQL Playground (graphql-playground-html NPM package) before version 1.6.22 have a severe XSS Reflection attack vulnerability. All unsanitized user input passed into renderPlaygroundPage() method could trigger this vulnerability. This has been patched in graphql-playground-html version 1.6.22. Note that some of the associated dependent middleware packages are also affected including but not limited to graphql-playground-middleware-express before version 1.7.16, graphql-playground-middleware-koa before version 1.6.15, graphql-playground-middleware-lambda before version 1.7.17, and graphql-playground-middleware-hapi before 1.6.13.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/prisma-labs/graphql-playground#security-details Third Party Advisory
https://github.com/prisma-labs/graphql-playground/commit/bf1883db538c97b076801a60677733816cb3cfb7 PatchThird Party Advisory
https://github.com/prisma-labs/graphql-playground/security/advisories/GHSA-4852-vrh7-28rf MitigationThird Party Advisory
https://github.com/prisma-labs/graphql-playground#security-details Third Party Advisory
https://github.com/prisma-labs/graphql-playground/commit/bf1883db538c97b076801a60677733816cb3cfb7 PatchThird Party Advisory
https://github.com/prisma-labs/graphql-playground/security/advisories/GHSA-4852-vrh7-28rf MitigationThird Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-4038), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.