How severe is CVE-2020-4038?

CVE-2020-4038 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-4038 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-4038?

CVE-2020-4038 primarily affects Prisma Graphql-playground-html. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-4038?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-4038 published?

CVE-2020-4038 was published on 2020-06-08 and last updated on 2026-06-17.

CVE-2020-4038

CVE-2020-4038 is a high-severity vulnerability in Prisma Graphql-playground-html with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 4.3
EPSS exploit prediction: 7% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Prisma Graphql-playground-html
Published: 2020-06-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-4038?: 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.
How severe is CVE-2020-4038?: CVE-2020-4038 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-4038 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-4038?: CVE-2020-4038 primarily affects Prisma Graphql-playground-html. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-4038?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-4038 published?: CVE-2020-4038 was published on 2020-06-08 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:prisma:graphql-playground-html:*:*:*:*:*:node.js:*:*
cpe:2.3:a:prisma:graphql-playground-middleware-express:*:*:*:*:*:node.js:*:*
cpe:2.3:a:prisma:graphql-playground-middleware-hapi:*:*:*:*:*:node.js:*:*
cpe:2.3:a:prisma:graphql-playground-middleware-koa:*:*:*:*:*:node.js:*:*
cpe:2.3:a:prisma:graphql-playground-middleware-lambda:*:*:*:*:*:node.js:*:*

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