{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.5.4"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "paymenter/paymenter"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.5.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55219"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-362"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-30T19:11:24Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe credit payment implementation in `app/Livewire/Invoices/Show.php` executes a pessimistic row lock (`lockForUpdate()`) outside of an active database transaction. Because MySQL/MariaDB requires an enclosing transaction to enforce row-level locks, the guard is ineffective. Concurrent payment requests can exploit this race condition to read the same credit balance simultaneously, allowing users to pay multiple invoices using the same credit balance.\n\n### Technical Details\nThe issue occurs because the application attempts to lock the user\u0027s credit balance row in the database (`lockForUpdate()`) without opening a database transaction. In database systems like MySQL, a row lock only works inside a formal transaction; without one, the lock is completely ignored.\n\nBecause there is no active lock, two payment requests sent at the exact same millisecond can look at the database at the same time. Both requests see the original credit balance, decide it is sufficient, and approve the payment.\n\n### Impact\nThis race condition allows any authenticated user with a valid credit balance to bypass balance restrictions and settle multiple pending invoices simultaneously for the cost of a single invoice.\n\nBecause the payment processes successfully through ExtensionHelper::addPayment(), the application provisions the corresponding services or digital goods, resulting in direct financial or resource loss to the platform.",
  "id": "GHSA-pgcq-8grm-5rx9",
  "modified": "2026-06-30T19:11:24Z",
  "published": "2026-06-30T19:11:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Paymenter/Paymenter/security/advisories/GHSA-pgcq-8grm-5rx9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Paymenter/Paymenter"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Paymenter has race condition in payWithCredit() that enables credit double-spend"
}