WWBN AVideo Affected by a PayPal IPN Replay Attack Enabling Wallet Balance Inflation via Missing Transaction Deduplication in ipn.php

{
  "id": "9ba7aa4375e39e98436a4702c78daf542d270a45d7e6f999f526d1a4169499c5",
  "url": "https://osv.dev/vulnerability/CVE-2026-39366",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "WWBN AVideo Affected by a PayPal IPN Replay Attack Enabling Wallet Balance Inflation via Missing Transaction Deduplication in ipn.php",
    "summary": "WWBN AVideo is an open source video platform. In versions 26.0 and prior, the PayPal IPN v1 handler at plugin/PayPalYPT/ipn.php lacks transaction deduplication, allowing an attacker to replay a single legitimate IPN notification to repeatedly inflate their wallet balance and renew subscriptions. The newer ipnV2.php and webhook.php handlers correctly deduplicate via PayPalYPT_log entries, but the v1 handler was never updated and remains actively referenced as the notify_url for billing plans.",
    "evidence": "osv:CVE-2026-39366",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-39366",
      "aliases": [
        "CVE-2026-39366",
        "GHSA-mmw7-wq3c-wf9p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/wwbn/avideo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8f53e9d9c6aaa07d51ace30691981edbbfb5ca1c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "26.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "8f53e9d9c6aaa07d51ace30691981edbbfb5ca1c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "26.0",
            "25.0",
            "24.0",
            "22.0",
            "21.0",
            "18.0",
            "14.3.1",
            "14.3",
            "12.4",
            "11.6",
            "11.5",
            "11.1.1",
            "11.1",
            "11",
            "10.8",
            "8.9.1",
            "8.9",
            "8.7",
            "8.6",
            "8.5",
            "8.1",
            "7.8",
            "7.7",
            "7.6",
            "7.4",
            "7.3",
            "7.2",
            "4.0",
            "3.4",
            "2.7",
            "2.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39366.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.564610970Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39366.json",
        "https://github.com/WWBN/AVideo/security/advisories/GHSA-mmw7-wq3c-wf9p",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-39366",
        "https://github.com/WWBN/AVideo/commit/8f53e9d9c6aaa07d51ace30691981edbbfb5ca1c"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-345"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39366.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-39366",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520191,
  "published_at": "2026-04-07T19:21:12.156+00:00"
}