Security advisory

{
  "id": "fc32e67d0308bf32e3d8a542ba73e3138f74aac07aac7e6b57471a60dafeefb5",
  "url": "https://osv.dev/vulnerability/CVE-2019-9837",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2019-9837",
    "summary": "Doorkeeper::OpenidConnect (aka the OpenID Connect extension for Doorkeeper) 1.4.x and 1.5.x before 1.5.4 has an open redirect via the redirect_uri field in an OAuth authorization request (that results in an error response) with the 'openid' scope and a prompt=none value. This allows phishing attacks against the authorization flow.",
    "evidence": "osv:CVE-2019-9837",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2019-9837",
      "aliases": [
        "CVE-2019-9837",
        "GHSA-vv4c-g6q7-p3q7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/doorkeeper-gem/doorkeeper-openid_connect",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e513867198fdac2b6100511d21f8d0a8de7dac58"
                },
                {
                  "fixed": "64b26fbedb88fe6e938b913cadfc54256e36d966"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openid:openid_connect:*:*:*:*:*:doorkeeper:*:*",
                    "range": [
                      {
                        "introduced": "1.4.0"
                      },
                      {
                        "fixed": "1.5.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.5.3",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2019-9837.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:34.766462017Z",
      "provider": "osv",
      "references": [
        "https://github.com/doorkeeper-gem/doorkeeper-openid_connect/blob/master/CHANGELOG.md",
        "https://github.com/doorkeeper-gem/doorkeeper-openid_connect/issues/61",
        "https://github.com/doorkeeper-gem/doorkeeper-openid_connect/pull/66"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2019-9837",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382594,
  "published_at": "2019-03-21T16:01:17.28+00:00"
}