{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "3.0.0"
              },
              {
                "fixed": "3.2.1"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "72b005c14cd3d11e0ef3afa3c9fa46bc07af444a"
            },
            {
              "fixed": "15f0eb32f856016b6a3a04c8679b9a12eb18c203"
            }
          ],
          "repo": "https://github.com/rejetto/hfs",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-204"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61503.json"
  },
  "details": "Rejetto HFS 3.0.0 through 3.2.0 returns observably different responses from its login endpoint depending on whether the submitted username exists. A remote unauthenticated attacker can use this to confirm valid account names, including the default admin account, facilitating password-guessing and session-forgery attacks.",
  "id": "CVE-2026-61503",
  "modified": "2026-07-17T03:41:40.717188559Z",
  "published": "2026-07-13T17:23:20.688Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61503.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-61503"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/rejetto-hfs-username-enumeration-via-login-response-differences"
    },
    {
      "type": "FIX",
      "url": "https://github.com/rejetto/hfs/releases/tag/v3.2.1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rejetto/hfs"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Rejetto HFS \u003c 3.2.1 Username Enumeration via Login Response Differences"
}