{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.5.6"
              },
              {
                "fixed": "0.8.0"
              },
              {
                "fixed": "0.7.2"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "54743baa65ddfc6ea473ece7e4e860e977c31393"
            },
            {
              "fixed": "3bd35f5b2921d8a26a403142ae0408f95e6463cc"
            }
          ],
          "repo": "https://github.com/fossbilling/fossbilling",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vp66-w6rc-x32p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-640"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53646.json"
  },
  "details": "FOSSBilling is a free, open-source billing and client management system. In versions 0.5.6 through 0.7.2, when a `ClientPasswordReset` record already exists for a client (from a previous unexpired reset request), subsequent calls to the `reset_password` guest API endpoint reuse the existing token instead of generating a new one. The 15-minute validity window is anchored to the first request's `created_at` timestamp, not the time of the most recent email. An attacker who obtained the original reset link remains able to use it even after the victim requests a new reset, because the original token is never invalidated or rotated. Version 0.8.0 patches the issue. Some workarounds are available. Configure a reverse proxy (e.g., Nginx, Apache, Cloudflare) to apply per-IP rate limiting to the `/client/reset-password` endpoint to minimize the window of opportunity, and/or manually clear expired `client_password_reset` records from the database after a client reports a suspected compromise.",
  "id": "CVE-2026-53646",
  "modified": "2026-08-12T03:51:08.969955543Z",
  "published": "2026-07-06T22:58:10.415Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53646.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-vp66-w6rc-x32p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53646"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "FOSSBilling: Client password reset token reuse allows persistent account takeover"
}