Authentication Bypass in extension "E-Mail MFA Provider" (mfa_email)

{
  "id": "a64a9247f84e2c775ea97cd51fd4515b7e0715abfc65fdada08ef1cdeed9b519",
  "url": "https://osv.dev/vulnerability/CVE-2026-4208",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Authentication Bypass in extension \"E-Mail MFA Provider\" (mfa_email)",
    "summary": "The extension fails to properly reset the generated MFA code after successful authentication. This leads to a possible MFA bypass for future login attempts by providing an empty string as MFA code to the extensions MFA provider.",
    "evidence": "osv:CVE-2026-4208",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-4208",
      "aliases": [
        "CVE-2026-4208",
        "GHSA-29r8-gvx4-r9w3"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mrsilaz/mfa_email",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3b0184c6e1ffb0fc652aa70321866fc93c28ba35"
                },
                {
                  "introduced": "826a941c9206fde8b82146e9f8624f9ab12e0dce"
                },
                {
                  "last_affected": "826a941c9206fde8b82146e9f8624f9ab12e0dce"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mrsilaz:mfa_mail:*:*:*:*:*:typo3:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mrsilaz:mfa_mail:2.0.0:*:*:*:*:typo3:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.0.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.0.0",
            "v1.0.5",
            "v2.0.0",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4208.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.715793521Z",
      "provider": "osv",
      "references": [
        "https://packagist.org",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4208.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-4208",
        "https://typo3.org/security/advisory/typo3-ext-sa-2026-007",
        "https://github.com/MrSilaz/mfa_email"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "TYPO3",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4208.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-4208",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513892,
  "published_at": "2026-03-17T08:34:52.141+00:00"
}