CVE-2026-14480 OpenPLC v3 External Control of File Name or Path
Authenticated attackers can write arbitrary files via path traversal, leading to native code execution during compilation in OpenPLC Runtime.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-14480?
CVE-2026-14480 is a high-severity path traversal vulnerability in OpenPLC, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-73
Which versions are affected by CVE-2026-14480?
How do I fix CVE-2026-14480?
No fix has been published for CVE-2026-14480 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-14480 being exploited?
There is no known exploitation of CVE-2026-14480 in the wild and no public exploit code.
Sources
Also known as GHSA-gx73-gv82-355v.