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CVE-2026-54134— OctoPrint: File exfiltration possible via query parameters on upload endpoints

Quick assessment

Affected
OctoPrint OctoPrint
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OctoPrint是OctoPrint团队开源的一款提供网页界面的3D打印机控制软件。 OctoPrint 1.11.8之前版本和2.0.0rc3之前版本存在输入验证错误漏洞，该漏洞源于Tornado上传处理器与Flask/Werkzeug解析请求参数存在差异，具有FILE_UPLOAD权限的攻击者可注入保留的内部上传字段，将任意主机文件作为临时上传并移至可下载目录，导致配置机密或其他可读文件泄露，并删除运行时文件影响重启。

CVSS 7.0 · High EPSS 0.32% · P24

Affected Version Matrix 2

VendorProduct Version RangeStatus
OctoPrint OctoPrint < 1.11.8 affected
>= 2.0.0rc1, < 2.0.0rc3 affected
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I. Basic Information for CVE-2026-54134

Vulnerability Information
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Vulnerability Title
OctoPrint: File exfiltration possible via query parameters on upload endpoints
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
OctoPrint 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OctoPrint是OctoPrint团队开源的一款提供网页界面的3D打印机控制软件。 OctoPrint 1.11.8之前版本和2.0.0rc3之前版本存在输入验证错误漏洞，该漏洞源于Tornado上传处理器与Flask/Werkzeug解析请求参数存在差异，具有FILE_UPLOAD权限的攻击者可注入保留的内部上传字段，将任意主机文件作为临时上传并移至可下载目录，导致配置机密或其他可读文件泄露，并删除运行时文件影响重启。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OctoPrint OctoPrint < 1.11.8 -

II. Public POCs for CVE-2026-54134

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: reserved-field query-param injection; token PROOF_839a15ff482fb83f exfiltrated via /api/files/local?path=/flag.txt
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 6980 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-54134

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Vendor Advisories for CVE-2026-54134 (1)

Vendor Pages for CVE-2026-54134 (1)

Other References for CVE-2026-54134 (1)

IV. Related Vulnerabilities

Same product: OctoPrint
Same vendor: OctoPrint
Same weakness: CWE-73

V. Comments for CVE-2026-54134

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