Security advisory

{
  "id": "2116147bcf4388110cda9e7e73261b203f4654050d649f9a21ff51edc58ac2b0",
  "url": "https://osv.dev/vulnerability/CVE-2021-3603",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3603",
    "summary": "PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.",
    "evidence": "osv:CVE-2021-3603",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-3603",
      "aliases": [
        "BIT-phpmailer-2021-3603",
        "CVE-2021-3603",
        "GHSA-77mr-wc79-m8j3"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/phpmailer/phpmailer",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "9256f12d8fb0cd0500f93b19e18c356906cbed3d"
                },
                {
                  "fixed": "45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:phpmailer_project:phpmailer:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "6.4.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v6.4.1",
            "v6.4.0",
            "v6.3.0",
            "v6.2.0",
            "v6.1.8",
            "v6.1.7",
            "v6.1.6",
            "v6.1.5",
            "v6.1.4",
            "v6.1.3",
            "v6.1.2",
            "v6.1.1",
            "v6.1.0",
            "v6.0.7",
            "v5.2.9",
            "v5.2.8",
            "v5.2.7",
            "v5.2.6",
            "v5.2.5",
            "v5.2.4",
            "v5.2.2",
            "v5.2.1",
            "v5.2.0",
            "v2.2.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3603.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:47.063810576Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM/",
        "https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/",
        "https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
                  },
                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-3603",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386133,
  "published_at": "2021-06-17T12:15:08.15+00:00"
}