OpenPLC OpenPLC — kwetsbaarheid 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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

• •Netwerktoegang tot het getroffen apparaat of segment is vereist.
• •Er zijn geen geldige inloggegevens nodig.
• •Geen gebruikersinteractie vereist.

• •Pas de laatste firmware- of software-update toe en valideer de integriteit ervan.
• •Beperk netwerktoegang tot het getroffen apparaat tot een dedicated OT-beheersegment.
• •Implementeer netwerksegmentatie conform zones en conduits (IEC 62443-3-2).
• •Monitor op afwijkend protocolverkeer via een OT-aware detectiesysteem.