POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.8.7 - Authorization Bypass via type connect-app API

{
  "id": "1999d8fa6e2fb736cd6d63121d3ad8edcbbea13b697d434af23f24e8cfb46cf6",
  "url": "https://osv.dev/vulnerability/CVE-2023-6875",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress <= 2.8.7 - Authorization Bypass via type connect-app API",
    "summary": "The POST SMTP Mailer – Email log, Delivery Failure Notifications and Best Mail SMTP for WordPress plugin for WordPress is vulnerable to unauthorized access of data and modification of data due to a type juggling issue on the connect-app REST endpoint in all versions up to, and including, 2.8.7. This makes it possible for unauthenticated attackers to reset the API key used to authenticate to the mailer and view logs, including password reset emails, allowing site takeover. CVE-2023-52233 appears to be a duplicate of this issue.",
    "evidence": "osv:CVE-2023-6875",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2023-6875",
      "aliases": [
        "CVE-2023-6875"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wpexpertsio/post-smtp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "437956ad80f774c66350ad620f75262cd50ebc34"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wpexperts:post_smtp:*:*:*:*:*:wordpress:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.8.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.5.9-beta.1",
            "2.8.7",
            "2.8.5",
            "2.8.4",
            "2.7.0",
            "2.8.3",
            "2.7.2",
            "2.6.0",
            "2.5.9.4",
            "2.5.9.3",
            "2.5.8",
            "2.5.7",
            "2.5.6",
            "2.5.5",
            "2.5.4",
            "2.5.3",
            "2.5.2",
            "2.5.1",
            "2.5.0",
            "2.5-rc.3",
            "2.5-rc.2",
            "2.5-rc.1",
            "2.5-beta.1",
            "2.4.3",
            "2.4.2-beta.2",
            "2.4.2",
            "2.4.1",
            "2.4",
            "2.4-beta.1",
            "2.3.1",
            "2.3",
            "2.2.1",
            "2.2",
            "2.2-beta.2",
            "2.1.8",
            "2.1.7",
            "2.1.6",
            "2.1.4",
            "2.1.4-rc.2",
            "2.1.4-rc.1",
            "2.1.4-beta.1",
            "2.1.2",
            "2.1.2-rc.2",
            "2.1.2-rc.1",
            "2.1.2-beta-1",
            "2.1.1.1",
            "2.1.1",
            "2.1",
            "2.1-beta.1",
            "2.0.27",
            "2.0.26",
            "2.0.25-beta.1",
            "2.0.25",
            "2.0.24",
            "2.0.23",
            "2.0.22",
            "2.0.21",
            "2.0.20",
            "2.0.19",
            "2.0.18",
            "2.0.17",
            "2.0.16",
            "2.0.15",
            "2.0.14",
            "2.0.13",
            "2.0.12",
            "2.0.11",
            "2.0.10",
            "2.0.9",
            "2.0.8",
            "2.0.7",
            "2.0.6",
            "2.0.5",
            "2.0.4",
            "2.0.3",
            "2.0.2",
            "2.0.1",
            "v1.9.8",
            "v1.9.7",
            "v1.9.6",
            "v1.9.5",
            "v1.9.4",
            "v1.9.3",
            "v.1.9.2",
            "v.1.9.1",
            "v.1.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-6875.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.444971266Z",
      "provider": "osv",
      "references": [
        "https://plugins.trac.wordpress.org/browser/post-smtp/trunk/Postman/Mobile/includes/rest-api/v1/rest-api.php#L60",
        "https://plugins.trac.wordpress.org/changeset/3016051/post-smtp/trunk?contextall=1&old=3012318&old_path=%2Fpost-smtp%2Ftrunk",
        "https://www.wordfence.com/threat-intel/vulnerabilities/id/e675d64c-cbb8-4f24-9b6f-2597a97b49af?source=cve",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6875.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-6875"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "Wordfence",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2.8.7"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/6xxx/CVE-2023-6875.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-6875",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493068,
  "published_at": "2024-01-11T08:33:06.214+00:00"
}