Security advisory

{
  "id": "b762bdbb47f607f31d314d3dde98046f063f66cf311cb49a9132f6b7dcf0765b",
  "url": "https://osv.dev/vulnerability/CVE-2020-26938",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-26938",
    "summary": "In oauth2-server (aka node-oauth2-server) through 3.1.1, the value of the redirect_uri parameter received during the authorization and token request is checked against an incorrect URI pattern (\"[a-zA-Z][a-zA-Z0-9+.-]+:\") before making a redirection. This allows a malicious client to pass an XSS payload through the redirect_uri parameter while making an authorization request. NOTE: this vulnerability is similar to CVE-2020-7741.",
    "evidence": "osv:CVE-2020-26938",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-26938",
      "aliases": [
        "CVE-2020-26938",
        "GHSA-4rg6-fm25-gc34"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/oauthjs/node-oauth2-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "0bbdcfeaaf0d73e06acc028cd0d009eafab70817"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:oauth2-server_project:oauth2-server:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "3.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.1.1",
            "v3.1.0",
            "v3.0.2",
            "v3.0.0",
            "v3.0.0-b4",
            "v3.0.0-b3.1",
            "v3.0.0-b3",
            "v2.4.1",
            "v2.4.0",
            "v2.3.0",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v1.5.2",
            "v1.5.1",
            "v1.5.0",
            "v1.4.1",
            "v1.4.0",
            "v1.3.2",
            "v1.3.1",
            "v1.3.0",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-26938.json"
          }
        }
      ],
      "modified": "2026-10-20T10:52:58.818428995Z",
      "provider": "osv",
      "references": [
        "https://tools.ietf.org/html/rfc3986#section-3",
        "https://tools.ietf.org/html/rfc6749#section-3.1.2",
        "https://github.com/oauthjs/node-oauth2-server/issues/637",
        "https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/grant-types/authorization-code-grant-type.js#L143",
        "https://github.com/oauthjs/node-oauth2-server/blob/91d2cbe70a0eddc53d72def96864e2de0fd41703/lib/validator/is.js#L12"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-26938",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384116,
  "published_at": "2022-08-29T21:15:08.863+00:00"
}