CVE-2026-59232 in Prospero Flow CRM
Summary
by MITRE • 07/31/2026
Cross-site Scripting in the lead index view in Roskus Prospero Flow CRM before 5.3.7 allows authenticated users holding the create or update lead permission to execute arbitrary JavaScript in the application origin via HTML markup stored in the lead name field, which the view renders through Blade's unescaped output directive and inside a JavaScript string literal in an onclick attribute.
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Analysis
by VulDB Data Team • 07/31/2026
This vulnerability represents a classic cross-site scripting flaw that affects the Roskus Prospero Flow CRM application prior to version 5.3.7. The security issue stems from improper input validation and output encoding within the lead index view component, creating an avenue for authenticated attackers to inject malicious JavaScript code into the application's user interface. The vulnerability specifically targets users who possess either create or update lead permissions, making it particularly concerning for organizations where multiple users have varying levels of access control.
The technical exploitation occurs through the lead name field, which serves as an entry point for malicious input that gets processed through Blade's unescaped output directive. This directive bypasses normal HTML escaping mechanisms that would typically prevent script execution when rendering user-supplied content. The stored HTML markup is subsequently rendered within a JavaScript string literal inside an onclick attribute, creating a context where the injected JavaScript code can be executed in the application origin. This particular vector demonstrates a dangerous combination of improper output encoding and insecure handling of user input within dynamic JavaScript contexts.
The operational impact of this vulnerability extends beyond simple script execution, as it allows authenticated users to potentially perform actions such as stealing session cookies, redirecting users to malicious sites, or executing unauthorized operations within the CRM system. Attackers could craft lead names containing malicious JavaScript that would execute whenever other users view the lead index page, particularly when interacting with elements containing onclick handlers. This creates a persistent threat vector where the malicious payload remains active until the affected version is patched, potentially compromising multiple user sessions and access credentials.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-79 (Cross-site Scripting) and represents a specific implementation flaw in the application's output encoding practices. The issue also maps to ATT&CK technique T1059.007 (Scripting) as it enables adversaries to execute malicious code through scripting languages within web applications. Organizations should prioritize immediate patching of affected systems, implementing proper input validation and output encoding mechanisms throughout their applications, particularly when handling user-generated content that may be rendered in JavaScript contexts. The vulnerability highlights the critical importance of maintaining secure coding practices and proper sanitization of all user inputs before they are processed or displayed within web interfaces.
Mitigation strategies should include immediate deployment of version 5.3.7 or later which addresses this specific XSS vulnerability through proper output encoding implementation. Organizations should also implement comprehensive input validation at multiple layers including client-side and server-side filtering, ensure that all dynamic content rendered in JavaScript contexts uses proper escaping mechanisms, and conduct regular security assessments to identify similar vulnerabilities in other application components. Additionally, implementing content security policies and monitoring user access patterns can help detect and prevent exploitation attempts while maintaining robust security posture against similar cross-site scripting threats.