CVE-2020-4038: GraphQL Playground (graphql-playground-html NPM package) before version 1.6.22 have a severe XSS Reflection at

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HIGH 7.4UPGRADEUPGRADEUPGRADE

CVE-2020-4038 is a high-severity flaw (CVSS 7.4) affecting graphql-playground-html, graphql-playground-middleware-express, graphql-playground-middleware-hapi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 befo

Why this priority

High severity
EPSS top 6%: very likely to be exploited

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	7.2% (top 6%)
CISA exploited list	No
Weakness	CWE-79
Published	2020-06-08
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: prisma

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-06-08 21:15 UTCPublished CVE record published
2026-06-17 03:19 UTCUpdated Record last modified

prisma graphql-playground-html UPGRADE

Affected: < 1.6.22

Fixed in: 1.6.22

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls graphql-playground-html

2. UPGRADE to 1.6.22

npm install graphql-playground-html@">=1.6.22"

prisma graphql-playground-middleware-express UPGRADE

Affected: < 1.7.16

Fixed in: 1.7.16

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls graphql-playground-middleware-express

2. UPGRADE to 1.7.16

npm install graphql-playground-middleware-express@">=1.7.16"

prisma graphql-playground-middleware-hapi UPGRADE

Affected: < 1.6.13

Fixed in: 1.6.13

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls graphql-playground-middleware-hapi

2. UPGRADE to 1.6.13

npm install graphql-playground-middleware-hapi@">=1.6.13"

prisma graphql-playground-middleware-koa UPGRADE

Affected: < 1.6.15

Fixed in: 1.6.15

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls graphql-playground-middleware-koa

2. UPGRADE to 1.6.15

npm install graphql-playground-middleware-koa@">=1.6.15"

prisma graphql-playground-middleware-lambda UPGRADE

Affected: < 1.7.17

Fixed in: 1.7.17

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls graphql-playground-middleware-lambda

2. UPGRADE to 1.7.17

npm install graphql-playground-middleware-lambda@">=1.7.17"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-4038?

graphql-playground-html: upgrade to 1.6.22; graphql-playground-middleware-express: upgrade to 1.7.16; graphql-playground-middleware-hapi: upgrade to 1.6.13. Exact commands for each OS are on this page.

Is CVE-2020-4038 being exploited?

CVE-2020-4038 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-4038 affect?

CVE-2020-4038 affects graphql-playground-html, graphql-playground-middleware-express, graphql-playground-middleware-hapi. Severity is high (CVSS 7.4). 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 ha

How urgent is CVE-2020-4038?

Priority 49/100. High severity; EPSS top 6%: very likely to be exploited

Software pages

npm packages vulnerabilities

References

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