Security advisory

{
  "id": "6b99318b95b62d4ec050c448ff1b943a2433b987b5a65e5350c0ee746f4461c6",
  "url": "https://osv.dev/vulnerability/CVE-2021-43812",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-43812",
    "summary": "The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.",
    "evidence": "osv:CVE-2021-43812",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-43812",
      "aliases": [
        "CVE-2021-43812",
        "GHSA-2mqv-4j3r-vjvp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/auth0/nextjs-auth0",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "762da1e8cd42f79f285f62d5f879b1b77ac9e94d"
                },
                {
                  "fixed": "0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:auth0:nextjs-auth0:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.6.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.6.1",
            "v1.6.0",
            "v1.5.0",
            "v1.4.2",
            "v1.4.1",
            "v1.4.0",
            "v1.3.1",
            "v1.3.0",
            "v1.2.0",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0-beta.2",
            "v1.0.0-beta.1",
            "v1.0.0-beta.0",
            "v0.16",
            "v0.15.0",
            "v0.13.0",
            "v0.12.0",
            "v0.11.0",
            "v0.10.0",
            "v0.9.0",
            "v0.8.0",
            "v0.7.0",
            "v0.6.0",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43812.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:04.295962691Z",
      "provider": "osv",
      "references": [
        "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvp",
        "https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-43812",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386821,
  "published_at": "2021-12-16T19:15:08.353+00:00"
}