CVE-2026-71268
OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write
- State
- Published
- Severity
- 9.9 Critical
- Published
- Aug 5, 2026
- Updated
- Aug 10, 2026
- Reserved
- Aug 5, 2026
Description
OpenPLC Runtime v3's compile_program function (webserver/openplc.py) parses directives from uploaded Structured Text (.st) program files and writes the referenced content to with no validation that file_path stays within the ./core directory. A path-validation function, validate_file_path, exists elsewhere in the codebase (webserver/credentials.py) but is never invoked from compile_program, leaving the sink unprotected.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.9 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | TuranSec |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
OpenPLC_v3thiagoralves |
|
References
- https://github.com/thiagoralves/OpenPLC_v3third-party-advisory
- https://github.com/thiagoralves/OpenPLC_v3/blob/master/webserver/openplc.pythird-party-advisory
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