Reflected XSS in Apache Sling XSS

Executive Summary

This is a reflected cross-site scripting (XSS) vulnerability in Apache Sling XSS versions 2.4.10 and prior. It occurs when the XSSAPI.getValidHref() method fails to properly neutralize user input, allowing an attacker to inject malicious scripts into web pages. The attacker must submit a value that the library does not sanitize correctly.

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Detection Guidance

To detect this vulnerability, inspect applications using Apache Sling XSS library versions 2.4.10 or prior. Check for improper input neutralization in features using XSSAPI.getValidHref(). Review server logs for suspicious input patterns or unexpected script execution.

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Impact Analysis

An attacker could exploit this to execute arbitrary JavaScript in a victim's browser when they visit a compromised page. This may lead to session hijacking, data theft, or defacement of the affected application.

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Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Organizations may face compliance penalties if exploited.

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Mitigation Strategies

Upgrade Apache Sling XSS to version 2.4.12 or later to address the XSS vulnerability. Ensure all applications using the library are updated. Review and sanitize user inputs to prevent reflected XSS attacks.

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