CVE-2026-22913: Cross-Site Scripting (XSS) Vulnerability

CVE-2026-22913 Overview

CVE-2026-22913 is a Cross-Site Scripting (XSS) vulnerability caused by improper handling of a URL parameter in SICK industrial products. This vulnerability allows attackers to execute arbitrary code in a user's browser after login, potentially leading to the extraction of sensitive data. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Attackers can execute malicious scripts in authenticated user sessions, enabling theft of session tokens, credentials, and sensitive operational data from industrial control systems.

Affected Products

• SICK Industrial Products (specific product versions not disclosed in advisory)
• Web-based management interfaces for SICK devices
• Industrial control system components with web interfaces

Discovery Timeline

• 2026-01-15 - CVE-2026-22913 published to NVD
• 2026-01-16 - Last updated in NVD database

Technical Details for CVE-2026-22913

Vulnerability Analysis

This vulnerability stems from insufficient input validation and output encoding when processing URL parameters in the web-based interface of affected SICK products. When a user navigates to a maliciously crafted URL and authenticates, the unvalidated parameter content is rendered in the browser context without proper sanitization. This allows an attacker to inject JavaScript code that executes with the privileges of the authenticated user.

The attack requires user interaction—specifically, the victim must click a malicious link and subsequently log in to the application. Once authenticated, the injected script runs in the security context of the victim's session, giving the attacker access to any data or functionality available to that user.

Root Cause

The root cause is improper neutralization of user-supplied input during web page generation (CWE-79). The application fails to adequately sanitize or encode URL parameter values before including them in the HTML response. This allows specially crafted input containing JavaScript code to be reflected back to the user's browser and executed as part of the trusted page content.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a malicious URL containing JavaScript payload in a vulnerable parameter, then delivers this URL to the victim through phishing emails, social engineering, or by embedding it in a web page. When the victim clicks the link and logs into the application, the malicious script executes in their browser session.

The attack flow typically follows these steps: The attacker identifies the vulnerable URL parameter and constructs a payload that will execute in the victim's browser. The malicious URL is then distributed to potential victims. Upon clicking the link and authenticating, the victim's browser executes the injected script, which can exfiltrate session cookies, capture keystrokes, or perform actions on behalf of the user.

For technical details on this vulnerability, refer to the SICK CSAF Security Advisory.

Detection Methods for CVE-2026-22913

Indicators of Compromise

• Unusual URL patterns in web server logs containing encoded JavaScript or HTML tags
• Unexpected outbound connections from user browsers to unknown external domains
• Authentication events followed by suspicious API calls or data access patterns

Detection Strategies

• Monitor web application firewall (WAF) logs for XSS attack signatures in URL parameters
• Implement Content Security Policy (CSP) violation reporting to detect script injection attempts
• Review HTTP access logs for URLs containing suspicious encoded characters such as %3Cscript%3E or javascript:

Monitoring Recommendations

• Enable detailed logging on web-facing SICK device interfaces
• Configure network monitoring to alert on unusual data exfiltration patterns from industrial control systems
• Implement browser-based monitoring solutions to detect unauthorized script execution

How to Mitigate CVE-2026-22913

Immediate Actions Required

• Review the SICK Company PSIRT Information for vendor-specific guidance and patches
• Restrict network access to affected web interfaces to trusted users and networks only
• Implement a Web Application Firewall (WAF) with XSS filtering rules in front of affected systems

Patch Information

SICK has published security advisories regarding this vulnerability. Administrators should consult the SICK CSAF Security Advisory (PDF) or JSON format for specific patch information and remediation guidance. Additionally, the SICK Cybersecurity Operating Guidelines provide general best practices for securing SICK industrial products.

For industrial control system security best practices, review the CISA ICS Recommended Practices.

Workarounds

• Implement strict Content Security Policy (CSP) headers to prevent inline script execution
• Segment industrial control networks to limit exposure of web interfaces to untrusted networks
• Train users to verify URL authenticity before clicking links and logging into sensitive systems
• Consider disabling unnecessary web-based management interfaces until patches are applied

# Example CSP header configuration for Apache (add to httpd.conf or .htaccess)
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self'"