CVE-2019-16991 Explained : Impact and Mitigation

FusionPBX prior to v4.5.7 is vulnerable to a Cross-Site Scripting (XSS) attack due to unsanitized user input.

Understanding CVE-2019-16991

This CVE identifies a security flaw in FusionPBX versions before v4.5.7 that could allow an attacker to execute XSS attacks.

What is CVE-2019-16991?

The vulnerability lies in the file "app\edit\filedelete.php" where the "file" variable from the URL is not sanitized, potentially leading to XSS attacks.

The Impact of CVE-2019-16991

Exploiting this vulnerability could result in an attacker injecting malicious scripts into web pages viewed by other users, compromising their data or session information.

Technical Details of CVE-2019-16991

FusionPBX's vulnerability to XSS attacks due to unsanitized user input.

Vulnerability Description

The file "app\edit\filedelete.php" in FusionPBX versions prior to v4.5.7 allows unsanitized user input, leading to potential XSS attacks.

Affected Systems and Versions

FusionPBX versions before v4.5.7

Exploitation Mechanism

Attacker injects malicious scripts via the unsanitized "file" variable in the URL

Mitigation and Prevention

Steps to address and prevent the CVE-2019-16991 vulnerability.

Immediate Steps to Take

Update FusionPBX to version v4.5.7 or later to mitigate the XSS vulnerability
Implement input validation and sanitization to prevent XSS attacks

Long-Term Security Practices

Regularly monitor and update web application security measures
Educate developers on secure coding practices to prevent similar vulnerabilities

Patching and Updates

Apply security patches promptly to address known vulnerabilities