CVE-2026-88020

Received Received - Intake

Improper Input Neutralization in OpenPLC Web Interface

Publication date: 2026-09-22

Last updated on: 2026-09-22

Assigner: ICS-CERT

Description

Autonomy Logic OpenPLC 3 is susceptible to an improper neutralization of input during web page generation vulnerability when the web interface attempts to route the program based on a query string parameter with no encoding.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-22

Last Modified

2026-09-22

Generated

2026-09-23

AI Q&A

2026-09-23

EPSS Evaluated

N/A

NVD

CVE-2026-88020

Affected Vendors & Products

Vendor	Product	Version / Range
autonomy_logic	openplc	3

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

Autonomy Logic OpenPLC 3 has a vulnerability where the web interface fails to properly encode input from a query string parameter. This allows attackers to inject malicious input that could alter how the program routes or processes data.

Detection Guidance

To detect this vulnerability, inspect web server logs for unusual query string parameters in OpenPLC web interface requests. Look for patterns like unencoded special characters or unexpected routing behavior. Use tools like curl to manually test endpoints with crafted query strings to observe improper neutralization.

Impact Analysis

This vulnerability could allow attackers to manipulate the web interface, potentially leading to unauthorized access, data leaks, or disruption of PLC operations. It may also enable cross-site scripting (XSS) attacks if user input is reflected unsafely.

Compliance Impact

This vulnerability could lead to data breaches or unauthorized access, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties or fines.

Mitigation Strategies

Immediately update OpenPLC to the latest patched version. If no patch is available, restrict access to the web interface via network segmentation or firewall rules. Implement input validation for query parameters in the web server configuration to enforce proper encoding.

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