{"id":"CVE-2026-5423","aliases":["EUVD-2026-54094","GHSA-fcpg-3fw5-vc65"],"status":"published","title":"Subscription Authentication Bypass via Unverified connectionParams.jwt","description":"@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00586,"percentile":0.4834,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-302"],"published":"2026-08-06T15:15:29Z","modified":"2026-10-28T02:30:54Z","products":[{"vendor":"@tinacms","product":"graphql"},{"vendor":"neo4j","product":"graphql"}],"references":[{"url":"https://neo4j.com/security/CVE-2026-5423","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/neo4j/graphql/security/advisories/GHSA-fcpg-3fw5-vc65","tags":["third-party-advisory","advisory"]},{"url":"https://registry.npmjs.org","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5423.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5423","tags":["advisory"]},{"url":"https://github.com/neo4j/graphql","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-5423","title":"Subscription Authentication Bypass via Unverified connectionParams.jwt","description":"@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.","status":"published","published":"2026-08-06T15:15:29.124Z","modified":"2026-08-06T15:45:22.183Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-302"],"updated_at":"2026-11-02T13:39:27.849196Z"}],"euvd":[{"id":"EUVD-2026-54094","description":"@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.","status":"published","published":"2026-08-06T15:15:29Z","modified":"2026-08-06T15:45:22Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T18:02:08.101336Z"}],"nvd":[{"id":"CVE-2026-5423","description":"@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.","status":"published","published":"2026-08-06T16:16:44.43Z","modified":"2026-10-24T16:10:00.153Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-302"],"updated_at":"2026-11-02T14:12:35.386166Z"}],"osv":[{"id":"CVE-2026-5423","title":"Subscription Authentication Bypass via Unverified connectionParams.jwt","description":"@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users.\nUpgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.","status":"published","published":"2026-08-06T15:15:29.124Z","modified":"2026-10-28T02:30:54.669903829Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-302"],"updated_at":"2026-11-02T15:45:10.818486Z"}]}}