CVE-2026-71268

CRITICAL 9.9

OpenPLC Runtime v3 Path Traversal in Structured Text FILE Directive Leading to Arbitrary File Write

CVSS Score

9.9

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-22
Vendor	thiagoralves
Product	openplc_v3
Published	Aug 5, 2026
Last Updated	Aug 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

thiagoralves / OpenPLC_v3

0 ≤ *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/thiagoralves/OpenPLC_v3 github.com: https://github.com/thiagoralves/OpenPLC_v3/blob/master/webserver/openplc.py

Credits

Alibek Baxtiyorov