{"id":"CVE-2026-54134","aliases":["GHSA-j4h9-pm27-4rfw","PYSEC-2026-2687"],"url":"https://o3.security/vulnerability/CVE-2026-54134","summary":"OctoPrint: File exfiltration possible via query parameters on upload endpoints","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.","published":"2026-08-21T18:28:15.925Z","modified":"2026-08-28T11:30:40.704102545Z","cvss":null,"epss":{"score":0.00212,"percentile":0.11438,"asOf":"2026-09-07"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"octoprint","fixedVersion":"1.11.8"},{"ecosystem":"PyPI","name":"octoprint","fixedVersion":"2.0.0rc3"}],"fix":{"url":"https://github.com/OctoPrint/OctoPrint/commit/579148beeb6d6e9b3d41b1cf32309b47218ed380","label":"OctoPrint/OctoPrint@579148b"},"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T11:30:40.704102545Z"}}