{"cve":"CVE-2026-54603","nvd":{"published":"2026-07-28T17:16:52.227","modified":"2026-10-23T23:10:00.157","status":"Awaiting Analysis","description":"OAuth2 is a Ruby wrapper for the OAuth 2.0 and 2.1 authorization frameworks, including OpenID Connect (OIDC). From 0.4.0 to 2.0.21, a protocol-relative redirect Location returned to OAuth2::Client#request overrides the request authority, so the bearer Authorization header is sent to an attacker-controlled host, leaking the credential. This issue is fixed in version 2.0.22.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","score":8.6},"cwes":["CWE-200","CWE-601"],"references":["https://github.com/ruby-oauth/oauth2/commit/0f0a474f1b38453e119e660c2daca742d4378ce9","https://github.com/ruby-oauth/oauth2/releases/tag/v2.0.22","https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9","https://lists.debian.org/debian-lts-announce/2026/10/msg00014.html","https://github.com/ruby-oauth/oauth2/security/advisories/GHSA-pp92-crg2-gfv9"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-54603","score":0.00448,"percentile":0.387,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-pp92-crg2-gfv9","url":"https://osv.dev/vulnerability/GHSA-pp92-crg2-gfv9","summary":"OAuth2::Client#request: Protocol-relative redirect Location overrides authority, leaking bearer Authorization to attacker host","modified":"2026-09-10T03:50:52.871332161Z","packages":[{"ecosystem":"RubyGems","name":"oauth2","purl":"pkg:gem/oauth2","ranges":[">=0.4.0 <2.0.22"],"fixed":["2.0.22"]}]}],"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."]}