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CVE-2026-14480— OpenPLC v3 External Control of File Name or Path

Quick assessment

Affected
OpenPLC OpenPLC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Autonomy OpenPLC Runtime是Autonomy公司的一款工业控制运行时软件。 Autonomy OpenPLC Runtime v3版本存在输入验证错误漏洞，该漏洞源于在legacy web UI程序上传流程中未验证或限制文件路径，直接将攻击者提供的文件名（prog_file）存入数据库并用作上传文件的目标路径，因此攻击者可以写入任意文件到webserver进程可写的位置。通过将恶意.cpp文件写入OpenPLC运行时核心目录，该文件会被编译进可执行运行时二进制文件，导致攻击者可将任意

CVSS 9.9 · Critical EPSS 0.62% · P48

Affected Version Matrix 2

VendorProduct Version RangeStatus
OpenPLC OpenPLC v3 affected
v4 unaffected
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I. Basic Information for CVE-2026-14480

Vulnerability Information
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Vulnerability Title
OpenPLC v3 External Control of File Name or Path
Source: CVE Program / CVE List V5
Vulnerability Description
OpenPLC Runtime v3 contains an authenticated arbitrary file write vulnerability in the legacy web UI program‑upload workflow. The application stores an attacker‑supplied filename (prog_file) directly into the Programs.File database field and later uses this value as the destination path for an uploaded file without validating or restricting the path. Because Python os.path.join() honors attacker‑controlled absolute paths, an authenticated user can write arbitrary files anywhere writable by the OpenPLC webserver process. In the default build pipeline, all C++ source files within the OpenPLC runtime core directory are automatically compiled into the executable runtime binary. By writing a malicious .cpp file into this directory, an authenticated attacker can escalate the arbitrary file write into arbitrary native code execution when the operator triggers a normal program compilation and runtime start.
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
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Autonomy OpenPLC Runtime 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Autonomy OpenPLC Runtime是Autonomy公司的一款工业控制运行时软件。 Autonomy OpenPLC Runtime v3版本存在输入验证错误漏洞，该漏洞源于在legacy web UI程序上传流程中未验证或限制文件路径，直接将攻击者提供的文件名（prog_file）存入数据库并用作上传文件的目标路径，因此攻击者可以写入任意文件到webserver进程可写的位置。通过将恶意.cpp文件写入OpenPLC运行时核心目录，该文件会被编译进可执行运行时二进制文件，导致攻击者可将任意
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
OpenPLC OpenPLC v3 -

II. Public POCs for CVE-2026-14480

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III. Intelligence Information for CVE-2026-14480

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Vendor Advisories for CVE-2026-14480 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-14480

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