Security advisory

{
  "id": "407266e2b0cc404a4d65e19c0fe44fb79f42c12ce9b1a631f721e3955b7a4eb6",
  "url": "https://osv.dev/vulnerability/CVE-2021-41265",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-41265",
    "summary": "Flask-AppBuilder is a development framework built on top of Flask. Verions prior to 3.3.4 contain an improper authentication vulnerability in the REST API. The issue allows for a malicious actor with a carefully crafted request to successfully authenticate and gain access to existing protected REST API endpoints. This only affects non database authentication types and new REST API endpoints. Users should upgrade to Flask-AppBuilder 3.3.4 to receive a patch.",
    "evidence": "osv:CVE-2021-41265",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-41265",
      "aliases": [
        "CVE-2021-41265",
        "GHSA-m3rf-7m4w-r66q",
        "PYSEC-2021-851"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/dpgaspar/flask-appbuilder",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4f7ca85bd1800e6eb5b5879aa16b18872d6b8e96"
                },
                {
                  "fixed": "eba517aab121afa3f3f2edb011ec6bc4efd61fbc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:dpgaspar:flask-appbuilder:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.3.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "eba517aab121afa3f3f2edb011ec6bc4efd61fbc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4f7ca85bd1800e6eb5b5879aa16b18872d6b8e96"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v3.3.4"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.3.3",
            "v3.3.2",
            "v3.3.1",
            "v3.3.0",
            "v3.2.3",
            "v3.2.2",
            "v3.2.1",
            "v3.2.0",
            "3.1.1",
            "v3.1.1",
            "v3.1.0",
            "v3.0.1",
            "v3.0.0",
            "v2.3.4",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3.0",
            "v2.2.3",
            "v2.2.2",
            "v2.2.1",
            "v2.2.1rc1",
            "v2.2.0",
            "v2.1.13",
            "v2.1.12",
            "v2.1.11",
            "v2.1.10",
            "v2.1.9",
            "v2.1.8",
            "v2.1.7",
            "v2.1.6",
            "v2.1.5",
            "v2.1.4",
            "v1.13.0",
            "v2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v1.12.5",
            "v1.12.4",
            "v1.12.3",
            "v1.12.2",
            "v1.12.1",
            "v1.9.6",
            "v1.12.0",
            "v1.11.1",
            "v1.11.0",
            "v1.10.0",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v1.9.2",
            "v1.9.1",
            "v1.9.0",
            "v1.8.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-41265.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:58.167327972Z",
      "provider": "osv",
      "references": [
        "https://github.com/dpgaspar/Flask-AppBuilder/releases/tag/v3.3.4",
        "https://github.com/dpgaspar/Flask-AppBuilder/security/advisories/GHSA-m3rf-7m4w-r66q",
        "https://github.com/dpgaspar/Flask-AppBuilder/commit/eba517aab121afa3f3f2edb011ec6bc4efd61fbc"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-41265",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386583,
  "published_at": "2021-12-09T17:15:07.963+00:00"
}