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CVE-2026-71268— OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write

Quick assessment

Affected
thiagoralves OpenPLC_v3
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.

Thiago Alves OpenPLC是Thiago Alves个人开发者的一款可编程逻辑控制器软件。 Thiago Alves OpenPLC存在路径遍历漏洞，该漏洞源于compile_program()函数在解析上传的Structured Text (.st)程序文件中的FILE指令时未验证文件路径是否在./core目录内，将内容写入任意文件系统路径，可能导致远程代码执行。

CVSS 9.9 · Critical EPSS 0.58% · P46

Affected Version Matrix 1

VendorProduct Version RangeStatus
thiagoralves OpenPLC_v3 ≤ * affected
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I. Basic Information for CVE-2026-71268

Vulnerability Information
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Vulnerability Title
OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write
Source: CVE Program / CVE List V5
Vulnerability Description
OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from uploaded Structured Text (.st) program files and writes the referenced content to with no validation that file_path stays within the ./core directory. A path-validation function, validate_file_path, exists elsewhere in the codebase (webserver/credentials.py) but is never invoked from compile_program, leaving the sink unprotected.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Thiago Alves OpenPLC 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Thiago Alves OpenPLC是Thiago Alves个人开发者的一款可编程逻辑控制器软件。 Thiago Alves OpenPLC存在路径遍历漏洞，该漏洞源于compile_program()函数在解析上传的Structured Text (.st)程序文件中的FILE指令时未验证文件路径是否在./core目录内，将内容写入任意文件系统路径，可能导致远程代码执行。
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
thiagoralves OpenPLC_v3 0 ~ * -

II. Public POCs for CVE-2026-71268

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6622 chars
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III. Intelligence Information for CVE-2026-71268

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Patches & Fixes for CVE-2026-71268 (1)

Vendor Pages for CVE-2026-71268 (1)

IV. Related Vulnerabilities

Same product: OpenPLC_v3
Same vendor: thiagoralves
Same weakness: CWE-22

V. Comments for CVE-2026-71268

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