OpenPLC v3

p a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-190-01.json" strong View CSAF /strong /a /p h2 Summary /h2 p strong Successful exploitation of this vulnerability could allow an authenticated attacker to write arbitrary files to the filesystem and escalate this into arbitrary native code execution through the normal OpenPLC program compilation process, potentially resulting in code execution as the OpenPLC runtime user. /strong /p p The following versions of OpenPLC v3 are affected: /p ul li OpenPLC v3 /li /ul div class="csaf-table" table class="tablesaw tablesaw-stack" data-tablesaw-mode="stack" data-tablesaw-minimap thead tr th role="columnheader" data-tablesaw-priority="persist" CVSS /th th role="columnheader" Vendor /th th role="columnheader" Equipment /th th role="columnheader" Vulnerabilities /th /tr /thead tbody tr td v3 9.9 /td td OpenPLC /td td OpenPLC v3 /td td External Control of File Name or Path /td /tr /tbody /table /div h3 Background /h3 ul li strong Critical Infrastructure Sectors: /strong Critical Manufacturing, Energy, Transportation Systems, Water and Wastewater /li li strong Countries/Areas Deployed: /strong Worldwide /li li strong Company Headquarters Location: /strong United States /li /ul hr h2 Vulnerabilities /h2 div class="csaf-accordion" p a class="csaf-accordion-toggle-all" href="#" Expand All + /a /p div class="csaf-accordion-item" h3 a class="csaf-accordion-toggle" href="#" CVE-2026-14480 /a /h3 div class="csaf-accordion-content" p 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. /p p a href="https://www.cve.org/CVERecord?id=CVE-2026-14480" View CVE Details /a /p hr h4 Affected Products /h4 h5 OpenPLC v3 /h5 div class="ics-vendor-version-status" div class="ics-vendor" strong Vendor: /strong br OpenPLC /div div class="ics-version" strong Product Version: /strong br OpenPLC OpenPLC: v3 /div div class="ics-status" strong Product Status: /strong br known_affected /div /div div class="ics-remediations" h6 Remediations /h6 p strong Vendor fix /strong br OpenPLC recommends users upgrade to OpenPLC v4 as OpenPLC v3 is end-of-life and is no