CVE-2026-41524 in BraveCMS-2.0
Summary
by MITRE • 05/08/2026
Brave CMS is an open-source CMS. Prior to commit 6c56603, page and article body content entered through the CKEditor rich-text editor is stored verbatim in the database and subsequently rendered with Laravel Blade's unescaped output directive {!! !!}. Any JavaScript or HTML injected by an editor-role user is permanently stored and executed in every visitor's browser upon page load. This issue has been patched via commit 6c56603.
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Analysis
by VulDB Data Team • 05/12/2026
This vulnerability represents a critical server-side request forgery and cross-site scripting flaw within the Brave CMS platform that stems from improper input sanitization and output escaping mechanisms. The vulnerability exists in the content management system's handling of rich-text editor inputs where user-generated content containing malicious javascript or html code is stored directly in the database without proper sanitization. When administrators or content creators utilize the CKEditor rich-text editor to create pages or articles, any injected script tags or malicious html elements are preserved exactly as entered by the user. The system then renders this content using Laravel Blade's unescaped output directive, which directly outputs the stored content without any HTML escaping or script sanitization, creating a persistent cross-site scripting vulnerability. This flaw allows attackers with editor privileges to inject malicious code that executes in the browsers of all visitors who access the affected pages, potentially enabling session hijacking, credential theft, or redirection to malicious sites.
The technical implementation of this vulnerability aligns with CWE-79: Cross-site Scripting and CWE-116: Improper Encoding or Escaping of Output, where the application fails to properly escape user-supplied data before rendering it in the browser context. The vulnerability's exploitation pathway follows a typical XSS attack pattern where malicious content stored in the database is executed during page rendering, creating a persistent threat that affects all users who access the compromised content. The issue manifests specifically in the content rendering pipeline where the CKEditor input is processed through the Laravel Blade templating engine without appropriate sanitization or escaping mechanisms. This represents a classic case of insufficient input validation and output encoding where the system trusts user input completely without proper security controls.
The operational impact of this vulnerability extends far beyond simple content manipulation, as it creates a persistent attack vector that can be leveraged for significant security breaches. Any user with editor privileges can potentially compromise the entire website's security posture by injecting malicious scripts that execute in every visitor's browser. This vulnerability enables attackers to perform session hijacking attacks, steal cookies, redirect users to malicious sites, or even perform actions on behalf of authenticated users through CSRF attacks. The persistent nature of the vulnerability means that once injected, malicious code continues to execute until manually removed from the database, making it particularly dangerous for content management systems where multiple editors may have access to the platform. The vulnerability affects all visitors to the website regardless of their authentication status, making it a critical threat to the platform's integrity and user security.
The remediation approach implemented in commit 6c56603 addresses this vulnerability by introducing proper input sanitization and output escaping mechanisms. The fix likely involves implementing proper HTML sanitization of user inputs before storage, ensuring that potentially dangerous script tags and javascript code are either removed or properly escaped before being stored in the database. Additionally, the solution probably includes modifying the Blade template rendering to use escaped output directives instead of the unescaped {!} syntax, or implementing proper content security policies that prevent script execution. The fix aligns with security best practices outlined in the OWASP Top Ten and follows the principle of least privilege by ensuring that user inputs are properly validated and sanitized before being processed by the application. Organizations should also consider implementing additional security measures such as content security policy headers, regular security audits of stored content, and monitoring for suspicious content modifications to prevent similar vulnerabilities from reoccurring in the future.