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CVE-2026-54134

OctoPrint: File exfiltration possible via query parameters on upload endpoints

HIGH
7
CVSS Score
Published: August 21, 2026 at 06:28 PM UTC
Updated: October 14, 2026 at 07:10 PM UTC
1 product affected across 1 vendorOctoPrint

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Severity
HIGH7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

OctoPrint· Octoprint
90%
v < 1.11.8>= 2.0.0rc1, < 2.0.0rc3
Affected range stops below 1.11.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.0rc3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (5)

x_refsource_CONFIRM
Source: cverecord
https://github.com/OctoPrint/OctoPrint/security/advisories/GHSA-j4h9-pm27-4rfw
x_refsource_MISC
Source: cverecord
https://github.com/OctoPrint/OctoPrint/commit/579148beeb6d6e9b3d41b1cf32309b47218ed380
x_refsource_MISC
Source: cverecord
https://github.com/OctoPrint/OctoPrint/commit/8e3348197db867c30a32d13984f0bd0d664be413
x_refsource_MISC
Source: cverecord
https://github.com/OctoPrint/OctoPrint/releases/tag/1.11.8
x_refsource_MISC
Source: cverecord
https://github.com/OctoPrint/OctoPrint/releases/tag/2.0.0rc3

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7HIGHGitHub_M
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-73

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