{"cve":"CVE-2018-20744","nvd":{"published":"2019-01-28T08:29:00.230","modified":"2026-06-17T01:53:23.383","status":"Modified","description":"The Olivier Poitrey Go CORS handler through 1.3.0 actively converts a wildcard CORS policy into reflecting an arbitrary Origin header value, which is incompatible with the CORS security design, and could lead to CORS misconfiguration security problems.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9},"cwes":["CWE-346"],"references":["http://www.securityfocus.com/bid/106834","https://github.com/rs/cors/issues/55","https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-chen.pdf","http://www.securityfocus.com/bid/106834","https://github.com/rs/cors/issues/55"],"products":["go_cors_project:go_cors"],"source":"nvd","synced_at":"2026-10-19T20:54:46.948512734+00:00"},"epss":{"cve":"CVE-2018-20744","score":0.00717,"percentile":0.53848,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-927h-x4qj-r242","url":"https://osv.dev/vulnerability/GHSA-927h-x4qj-r242","summary":"github.com/gofiber/fiber/v2 vulnerable to Origin Validation Error","modified":"2024-05-20T21:53:21Z","packages":[{"ecosystem":"Go","name":"github.com/gofiber/fiber/v2","purl":"pkg:golang/github.com/gofiber/fiber/v2","ranges":[">=2.0.0 <2.43.0"],"fixed":["2.43.0"]},{"ecosystem":"Go","name":"github.com/rs/cors","purl":"pkg:golang/github.com/rs/cors","ranges":["<1.5.0"],"fixed":["1.5.0"]}]},{"id":"GO-2023-1792","url":"https://osv.dev/vulnerability/GO-2023-1792","summary":"Insecure wildcard CORS policy in github.com/rs/cors","modified":"2024-05-20T16:03:47Z","packages":[{"ecosystem":"Go","name":"github.com/rs/cors","purl":"pkg:golang/github.com/rs/cors","ranges":["<1.5.0"],"fixed":["1.5.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}