External Control of File Name or Path in OctoPrint - CVE-2026-54134
Published: November 9, 2026
Vulnerability identifier: #VU162908
CSH Severity: Low
CVSS v4: 7 [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]
CVE-ID: CVE-2026-54134
CWE-ID: CWE-73
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated adjacent-network attacker with FILE_UPLOAD permission to exfiltrate host files readable by OctoPrint, including configuration secrets.
The vulnerability exists due to incomplete validation of reserved file-path parameters in OctoPrint's upload endpoints when processing query parameters or inconsistently parsed requests. An authenticated adjacent-network attacker with FILE_UPLOAD permission can inject these parameters to make OctoPrint treat a host file as an upload and move it into the upload folder for downloading.
Affected software
OctoPrint
How to mitigate CVE-2026-54134
Install security update from vendor's website.
OctoPrint - addressed in versions 1.11.8, 2.0.0