{"id":"CVE-2021-39185","state":"PUBLISHED","title":"Default CORS config allows any origin with credentials","description":"Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the default CORS configuration is vulnerable to an origin reflection attack. The middleware is also susceptible to a Null Origin Attack. The problem is fixed in 0.21.27, 0.22.3, 0.23.2, and 1.0.0-M25. The original `CORS` implementation and `CORSConfig` are deprecated. See the GitHub GHSA for more information, including code examples and workarounds.","publishedAt":"2021-09-01T19:25:09.000Z","updatedAt":"2024-08-04T01:58:18.235Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["http4s http4s"],"affected":[{"vendor":"http4s","product":"http4s","versions":[{"version":"< 0.21.27","status":"affected"},{"version":">= 0.22.0, < 0.22.3","status":"affected"},{"version":">= 0.23.0, < 0.23.2","status":"affected"},{"version":">= 1.0.0-M1, <= 1.0.0-M24","status":"affected"}]}],"references":["https://github.com/http4s/http4s/security/advisories/GHSA-52cf-226f-rhr6","https://github.com/http4s/http4s/releases/tag/v0.23.2"],"weaknesses":["CWE-346"],"ingestedAt":"2026-10-29T19:48:52.666Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/39xxx/CVE-2021-39185.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-39185","state":"PUBLISHED","datePublished":"2021-09-01T19:25:09.000Z","dateUpdated":"2024-08-04T01:58:18.235Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2021-08-16T00:00:00.000Z"},"containers":{"cna":{"title":"Default CORS config allows any origin with credentials","descriptions":[{"lang":"en","value":"Http4s is a minimal, idiomatic Scala interface for HTTP services. In http4s versions 0.21.26 and prior, 0.22.0 through 0.22.2, 0.23.0, 0.23.1, and 1.0.0-M1 through 1.0.0-M24, the default CORS configuration is vulnerable to an origin reflection attack. The middleware is also susceptible to a Null Origin Attack. The problem is fixed in 0.21.27, 0.22.3, 0.23.2, and 1.0.0-M25. The original `CORS` implementation and `CORSConfig` are deprecated. See the GitHub GHSA for more information, including code examples and workarounds."}],"affected":[{"vendor":"http4s","product":"http4s","versions":[{"version":"< 0.21.27","status":"affected"},{"version":">= 0.22.0, < 0.22.3","status":"affected"},{"version":">= 0.23.0, < 0.23.2","status":"affected"},{"version":">= 1.0.0-M1, <= 1.0.0-M24","status":"affected"}]}],"references":[{"url":"https://github.com/http4s/http4s/security/advisories/GHSA-52cf-226f-rhr6","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/http4s/http4s/releases/tag/v0.23.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","dateUpdated":"2021-09-01T19:25:09.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa"},"source":{"advisory":"GHSA-52cf-226f-rhr6","discovery":"UNKNOWN"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-39185","STATE":"PUBLIC","TITLE":"Default CORS config allows any origin with credentials"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"http4s","version":{"version_data":[{"version_value":"< 0.21.27"},{"version_value":">= 0.22.0, < 0.22.3"},{"version_value":">= 0.23.0, < 0.23.2"},{"version_value":">= 1.0.0-M1, <= 1.0.0-M24"}]}}]},"vendor_name":"http4s"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Http4s is a minimal, idiomatic Scala interface for HTTP services. 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