GHSA-x4r7-m2q9-69c8 · Severity: high · Ecosystem: npm — GraphiQL introspection schema template injection attack
GraphiQL is the reference implementation of this monorepo, GraphQL IDE, an official project under the GraphQL Foundation. All versions of graphiql older than [email protected] are vulnerable to compromised HTTP schema introspection responses or schema prop values with malicious GraphQL type names, exposing a dynamic XSS attack surface that can allow code injection on operation autocomplete. In order for the attack to take place, the user must load a vulnerable schema in graphiql. There are a number of ways that can occur. By default, the schema URL is not attacker-controllable in graphiql or in its suggested implementations or examples, leaving only very complex attack vectors. If a custom implementation of graphiql's fetcher allows the schema URL to be set dynamically, such as a URL query parameter like ?endpoint= in graphql-playground, or a database provided value, then this custom graphiql implementation is vulnerable to phishing attacks, and thus much more readily available, low or no privelege level xss attacks. The URLs could look like any generic looking graphql schema URL. It should be noted that desktop clients such as Altair, Insomnia, Postwoman, do not appear to be impacted by this. This vulnerability does not impact codemirror-graphql, monaco-graphql or other dependents, as it exists in onHasCompletion.ts in graphiql. It does impact all forks of graphiql, and every released version of graphiql.
Conclusion & alert: CVE-2021-41248 is rated Moderate Risk (49.8/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.03%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.38% | 1.03% | +0.65% |
| 2 | 2025-03-30 | 0.54% | 0.38% | -0.16% |
| 3 | 2025-03-29 | — | 0.54% | — |
Full EPSS history (9 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.1 | 3.1 | HIGH |
|
1.6 | 5.5 | [email protected] |
| 4.7 | 3.1 | MEDIUM |
|
1.6 | 2.7 | [email protected] |
| 2.6 | 2.0 | LOW |
|
4.9 | 2.9 | [email protected] |
GHSA-x4r7-m2q9-69c8 · Severity: high · Ecosystem: npm — GraphiQL introspection schema template injection attack
| URL | Tags |
|---|---|
| https://github.com/graphql/graphiql/commit/cb237eeeaf7333c4954c752122261db7520f7bf4 | Patch Third Party Advisory |
| https://github.com/graphql/graphiql/security/advisories/GHSA-x4r7-m2q9-69c8 | Third Party Advisory |
| https://github.com/graphql/graphql-playground/security/advisories/GHSA-59r9-6jp6-jcm7 | Not Applicable Third Party Advisory |