Executive Summary

CVE-2021-47906 is a stored cross-site scripting (XSS) vulnerability in bloofoxCMS versions 0.5.1.0 through 0.5.2.1. It exists in the 'text' parameter of articles, allowing authenticated attackers to inject malicious JavaScript payloads. When these scripts are stored and later executed in the context of authenticated users viewing the affected content, attackers can perform actions such as stealing user cookies and potentially hijacking sessions. [1, 2]

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Impact Analysis

This vulnerability can impact you by allowing an attacker with valid login credentials to inject malicious scripts into article content. When other authenticated users view this content, the malicious scripts execute in their browsers, potentially stealing their cookies and session information. This can lead to unauthorized access to user accounts, session hijacking, and other malicious activities within the CMS environment. [1, 2]

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Detection Guidance

This vulnerability can be detected by checking for the presence of malicious JavaScript payloads injected into the 'text' parameter of articles within the administrative interface of bloofoxCMS versions 0.5.1.0 through 0.5.2.1. Specifically, an authenticated user can verify if the 'text' field in articles contains suspicious scripts such as <img src=# onerror=alert('xss')>. Detection involves logging into the admin panel, navigating to the articles section, and inspecting the content of articles for injected scripts. There are no specific network commands provided, but manual inspection or automated scanning tools targeting stored XSS in the 'text' parameter can be used. [2]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the administrative interface to trusted users only, ensuring that only authenticated and authorized users can create or edit articles. Additionally, applying input validation and output encoding on the 'text' parameter to neutralize malicious scripts is critical. If possible, upgrade to a version of bloofoxCMS that patches this vulnerability or apply patches provided by the vendor. As a temporary measure, review and remove any suspicious scripts from existing articles to prevent exploitation. [1, 2]

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