{"id":"CVE-2021-41249","aliases":["GHSA-59r9-6jp6-jcm7"],"url":"https://o3.security/vulnerability/CVE-2021-41249","summary":"XSS vulnerability in GraphQL Playground from untrusted schemas","details":"GraphQL Playground is a GraphQL IDE for development of graphQL focused applications. All versions of graphql-playground-react older than graphql-playground-react@1.7.28 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 malicious schema in graphql-playground. There are several ways this can occur, including by specifying the URL to a malicious schema in the endpoint query parameter. If a user clicks on a link to a GraphQL Playground installation that specifies a malicious server, arbitrary JavaScript can run in the user's browser, which can be used to exfiltrate user credentials or other harmful goals. If you are using graphql-playground-react directly in your client app, upgrade to version 1.7.28 or later.","published":"2021-11-04T20:15:08.597Z","modified":"2026-07-09T01:06:58.170141Z","cvss":{"score":4.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.01182,"percentile":0.64912,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"graphql-playground-react","fixedVersion":"1.7.28"}],"fix":{"url":"https://github.com/graphql/graphql-playground/commit/b8a956006835992f12c46b90384a79ab82bcadad","label":"graphql/graphql-playground@b8a9560"},"references":[{"type":"ADVISORY","url":"https://github.com/graphql/graphiql/security/advisories/GHSA-x4r7-m2q9-69c8"},{"type":"ADVISORY","url":"https://github.com/graphql/graphql-playground/security/advisories/GHSA-59r9-6jp6-jcm7"},{"type":"FIX","url":"https://github.com/graphql/graphql-playground/commit/b8a956006835992f12c46b90384a79ab82bcadad"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T01:06:58.170141Z"}}