CVE-2026-14480

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.

CVSS v3 9.9 CRITICAL

9.9^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.1 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-190-01.json
https://www.cisa.gov/news-events/ics-advisories/icsa-26-190-01

Configurations

No configuration.

History

10 Jul 2026, 23:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-10 23:16

Updated : 2026-07-13 20:20

NVD link : CVE-2026-14480

Mitre link : CVE-2026-14480

CVE.ORG link : CVE-2026-14480

JSON object : View

Products Affected

No product.

CWE

CWE-73

External Control of File Name or Path

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