{"id":"CVE-2026-63183","title":"OmniAuth: Host Header Injection Vulnerability","summary":"OmniAuth is a flexible authentication system utilizing Rack middleware. Prior to 2.2.0, OmniAuth derives provider callback URLs from request-controlled host information when neither a fixed full_host nor framework-level incoming host val…","severity":"medium","cvss":6.9,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:L/SA:N","cvssSource":"cna","cwe":["CWE-346"],"vendor":"omniauth","product":"omniauth","affected":["omniauth < 2.2.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T19:19:56.610534Z"},"published":"2026-11-04","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:20:06.749Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63183","references":[{"url":"https://github.com/omniauth/omniauth/security/advisories/GHSA-m27g-v28p-f9fx","label":"https://github.com/omniauth/omniauth/security/advisories/GHSA-m27g-v28p-f9fx"},{"url":"https://github.com/omniauth/omniauth/commit/943b44faea242f063fa9230254fe7d60cfcc9c90","label":"https://github.com/omniauth/omniauth/commit/943b44faea242f063fa9230254fe7d60cfcc9c90"}],"tags":["cve.org"],"epss":0.00181,"epssPercentile":0.0774,"ingestedAt":"2026-11-05T22:38:31.522Z","slug":"CVE-2026-63183","body":"## Overview\n\nOmniAuth is a flexible authentication system utilizing Rack middleware. Prior to 2.2.0, OmniAuth derives provider callback URLs from request-controlled host information when neither a fixed full_host nor framework-level incoming host validation is configured. A remote unauthenticated client can supply a forged Host header, creating a host header injection risk in applications whose web framework does not verify incoming host headers. Applications using appropriately configured Rails host authorization or a fixed full_host are not affected by this path. This issue is fixed in version 2.2.0.\n\n## Affected\n\n- `omniauth < 2.2.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":38,"depthScoreParts":{"impact":38,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}