A recently discovered Cross-Site Scripting (XSS) vulnerability poses a notable risk to the GSVoIP web panel, specifically in version 2.0.90. The vulnerability arises from improper sanitization of the `msg` parameter in the `/painel/gateways.php/error` endpoint. Attackers can exploit this weakness by crafting a malicious URL, which, when accessed by a victim, allows the execution of arbitrary JavaScript within the user's browser context.
With a CVSS score of 6.1, this vulnerability is classified as medium severity. Its implications are significant as it can lead to unauthorized script execution, session hijacking, and phishing attacks. Given the nature of the vulnerability, organizations using GSVoIP should take immediate action to mitigate potential exploitation.
Currently, this vulnerability is awaiting analysis, and there is no confirmed public exploit; however, the potential for exploitation remains a concern. Organizations should prioritize patching efforts to protect against this threat.
Organizations should address this vulnerability in their patch management cycle to prevent possible exploitation by malicious actors.
Vulnerability Details
The Cross-Site Scripting (XSS) vulnerability in the GSVoIP web panel allows attackers to inject malicious scripts via the `msg` parameter in the specified endpoint. The vulnerability is classified under CWE-79, indicating improper input validation. The CVSS score of 6.1 reflects the medium severity of this risk, with potential impacts on confidentiality and integrity.
This vulnerability was published on May 1, 2026, and is classified as medium severity due to its potential impact on users and systems. The attack vector is network-based, requiring user interaction to exploit, reflecting a low attack complexity.
Technical Analysis
The root cause of this vulnerability is the failure to sanitize user-supplied input, specifically the `msg` parameter. This oversight allows attackers to inject arbitrary JavaScript code into the HTML response, which is executed in the context of the victim's browser.
The attack vector is network-based, meaning an attacker can exploit this vulnerability remotely without physical access to the target system. The attack complexity is low, as it involves sending a crafted URL to the victim, who must interact with it, typically by clicking on a link.
No special privileges are required for an attacker to exploit this vulnerability, making it accessible to a broader range of attackers. User interaction is necessary, as the victim must visit the malicious URL for the attack to succeed.
The confidentiality and integrity impacts are rated as low, but the potential for unauthorized script execution can lead to significant risks for users, including session hijacking and phishing attacks.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized access to user sessions and sensitive information. Given the nature of XSS attacks, the blast radius can be extensive, affecting all users who interact with the compromised web panel.
Organizations should assess the impact of this vulnerability in their deployment environments, especially if the GSVoIP web panel is accessible to untrusted networks. The urgency for remediation is medium, considering the CVSS score and the potential for exploitation.
Organizations must prioritize patching this vulnerability to prevent possible exploitation by attackers. Regular security assessments should also be conducted to identify and mitigate similar vulnerabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version is GSVoIP web panel version 2.0.90. Organizations using this version should take immediate steps to apply patches or updates to mitigate risks.
Mitigation & Remediation
Organizations should prioritize patching this vulnerability as part of their security maintenance. Regular updates to the GSVoIP web panel and proper input validation mechanisms should be enforced to prevent similar vulnerabilities.
For detailed guidance, organizations can consult resources on application security assessment and implement appropriate security controls.
Detection Guidance
Monitoring for anomalous behavior in the web panel logs can help detect attempts to exploit this vulnerability. Look for unusual input patterns in the `msg` parameter and track user interactions that may indicate exploitation.
AppSecure Threat Intelligence Insight
This vulnerability represents a common security issue in web applications. Security teams should learn from this incident to enhance their input validation practices and reduce the attack surface.
To further strengthen security posture, organizations can engage in red teaming assessments, which provide insights into potential vulnerabilities.
Organizations may also benefit from continuous engagement with security testing practices, such as continuous penetration testing, to proactively identify and remediate vulnerabilities.
Lastly, organizations should consider developing a vulnerability management program to systematically address security weaknesses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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