{"apiVersion":"1.0","identifier":"CVE-2026-54134","description":"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.","publishedAt":"2026-08-21T19:17:03","lastModifiedAt":"2026-08-26T18:16:40","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54134","cvssScore":7,"cvssVector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.00212,"riskScore":0.71,"affectedProduct":"OctoPrint","affectedVersions":"<1.11.8, <2.0.0rc3","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-54134","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-54134","en":"https://www.redsauce.net/en/cves/CVE-2026-54134","fr":"https://www.redsauce.net/fr/cves/CVE-2026-54134","pt":"https://www.redsauce.net/pt/cves/CVE-2026-54134","de":"https://www.redsauce.net/de/cves/CVE-2026-54134","sk":"https://www.redsauce.net/sk/cves/CVE-2026-54134","el":"https://www.redsauce.net/el/cves/CVE-2026-54134"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-54134"}}