CVE WatchAug 21, 2026

CVE-2026-54134

OctoPrint provides a web interface for controlling consumer 3D printers. Prior to 1.11.8 and 2.0.0rc3, OctoPrint's custom Tornado upload han

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Aug 21, 2026 · Last modified: Aug 21, 2026 · CWE-73

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-49360—

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