{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.11.8"
              },
              {
                "introduced": "2.0.0rc1"
              },
              {
                "fixed": "2.0.0rc3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "d0268b28427c6dc632bccdc75433ba67e53a5650"
            },
            {
              "fixed": "42be7409d4820431043da48ece30014e26b47073"
            },
            {
              "fixed": "3e1fa9c6679df57bd50d425b90bef89e880d1385"
            },
            {
              "fixed": "579148beeb6d6e9b3d41b1cf32309b47218ed380"
            },
            {
              "fixed": "8e3348197db867c30a32d13984f0bd0d664be413"
            }
          ],
          "repo": "https://github.com/octoprint/octoprint",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-j4h9-pm27-4rfw"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-73"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54134.json"
  },
  "details": "OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, OctoPrint's custom Tornado upload handler and Flask with Werkzeug parse request parameters differently, allowing an attacker with FILE_UPLOAD permission to inject reserved internal upload fields through query parameters or parser differentials despite the earlier GHSA-m9jh-jf9h-x3h2 fix. The affected endpoints are /api/files/{local|sdcard}, /api/languages, /plugin/backup/restore, and /plugin/pluginmanager/upload_file. An attacker can make OctoPrint treat an arbitrary host file as a temporary upload, move it into a downloadable upload directory, disclose configuration secrets or other readable files, and remove runtime files in a way that can affect a later restart. This issue is fixed in versions 1.11.8 and 2.0.0rc3.",
  "id": "CVE-2026-54134",
  "modified": "2026-08-23T03:42:36.416987459Z",
  "published": "2026-08-21T18:28:15.925Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OctoPrint/OctoPrint/releases/tag/1.11.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OctoPrint/OctoPrint/releases/tag/2.0.0rc3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54134.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-j4h9-pm27-4rfw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54134"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OctoPrint/OctoPrint/commit/579148beeb6d6e9b3d41b1cf32309b47218ed380"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OctoPrint/OctoPrint/commit/8e3348197db867c30a32d13984f0bd0d664be413"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OctoPrint: File exfiltration possible via query parameters on upload endpoints"
}