PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code

{
  "id": "ce4e97dff89acd26a893e3c94a8627225904783a41450c3021817efafac4ed05",
  "url": "https://osv.dev/vulnerability/CVE-2026-108109",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PHPNuxBill through 2025.3.20 Account Takeover via Brute-Forceable Password Reset Code",
    "summary": "PHPNuxBill through 2025.3.20 contains an account takeover vulnerability in the customer password reset flow in system/controllers/forgot.php that allows unauthenticated attackers to brute-force the 6-digit otp_code. Attackers knowing a customer username can guess the code without attempt limits or lockout, then read the newly set password from the HTTP response to hijack the account.",
    "evidence": "osv:CVE-2026-108109",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-108109",
      "aliases": [
        "CVE-2026-108109",
        "GHSA-337r-rrrc-r559"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/hotspotbilling/phpnuxbill",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "c3c2a92d468af91136d747b75142ed72f10320cc"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "c3c2a92d468af91136d747b75142ed72f10320cc"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2025.3.13",
            "2025.3.10",
            "2025.2.3",
            "2025.1.16",
            "2024.9.13",
            "2024.8.28",
            "2024.8.2",
            "2024.7.25",
            "2024.7.24",
            "2024.7.15",
            "2024.6.21",
            "2024.5.21",
            "2024.5.14",
            "2024.4.23",
            "2024.4.15",
            "2024.4.3",
            "2024.3.22",
            "2024.3.18",
            "2024.3.15",
            "2024.3.14",
            "2024.3.6",
            "2024.3.3.1",
            "2024.3.3",
            "2024.2.29",
            "2024.2.27",
            "2024.2.26.1",
            "2024.2.26",
            "2024.2.23.1",
            "2024.2.23",
            "2024.2.21",
            "2024.2.20",
            "2024.2.19",
            "2024.2.7",
            "2024.2.5",
            "2024.1.19",
            "2024.1.17",
            "2024.1.16",
            "2024.1.11",
            "2023.12.21",
            "2023.12.19",
            "2023.12.14",
            "2023.10.27.1",
            "2023.11.17",
            "2023.10.27",
            "2023.10.25",
            "2023.10.20",
            "2023.10.17",
            "6.0.0",
            "5.5",
            "5.4",
            "5.3",
            "5.2.2",
            "5.2.1",
            "5.2",
            "v5.1.14",
            "v5.1.13",
            "v5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-108109.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.614871033Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108109.json",
        "https://github.com/hotspotbilling/phpnuxbill/security/advisories/GHSA-337r-rrrc-r559",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-108109",
        "https://www.vulncheck.com/advisories/phpnuxbill-through-2025.3.20-account-takeover-via-brute-forceable-password-reset-code",
        "https://github.com/hotspotbilling/phpnuxbill/commit/c3c2a92d468af91136d747b75142ed72f10320cc",
        "https://github.com/hotspotbilling/phpnuxbill",
        "https://github.com/hotspotbilling/phpnuxbill/blob/2025.3.13/system/controllers/forgot.php#L41"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-307"
        ],
        "cna_assigner": "VulnCheck",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2025.3.20"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "last_affected": "2025.3.20"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108109.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-108109",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507114,
  "published_at": "2026-10-09T14:33:32.201+00:00"
}