CVE-2025-26776 is a critical vulnerability affecting NotFound Chaty Pro that allows for unrestricted upload of files with dangerous types. This vulnerability can be exploited to upload a web shell to a web server, posing significant risks to the integrity and confidentiality of the affected systems. The CVSS score for this vulnerability is 10, which indicates a severe risk due to its potential impact.
The vulnerability is classified under CWE-434, which pertains to unrestricted file upload vulnerabilities, making it a target for attackers seeking to compromise system security. The urgency for defenders is high, as the potential for exploitation is significant, and organizations are advised to address this issue in their patch cycle.
As of now, the status of this vulnerability is deferred; however, organizations should not delay in implementing security measures. The exploitability score is high, underscoring the need for immediate attention to mitigate risks.
Organizations should prioritize patching immediately to prevent unauthorized access and potential data breaches resulting from this vulnerability.
Vulnerability Details
The CVE description states: 'Unrestricted Upload of File with Dangerous Type vulnerability in NotFound Chaty Pro allows Upload a Web Shell to a Web Server.' This issue affects versions of Chaty Pro from n/a through 3.3.3. The CVSS score for this vulnerability is 10, indicating a critical severity level. This vulnerability is classified as CWE-434, pointing to its nature of allowing unrestricted file uploads.
Technical Analysis
The root cause of CVE-2025-26776 lies in inadequate validation of file uploads, allowing attackers to upload malicious files to the server. The attack vector is network-based, and the attack complexity is low, meaning that no special conditions need to be met for the exploit to be successful. The vulnerability requires no privileges, and user interaction is not necessary for exploitation.
The vulnerability impacts confidentiality, integrity, and availability significantly, as an attacker can gain full control of the affected web server through the uploaded web shell.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data and system control. The blast radius is significant, as the vulnerability can affect all installations of vulnerable Chaty Pro versions. The urgency assessment based on the CVSS score indicates that organizations should prioritize this vulnerability in their patching cycle to mitigate risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of Chaty Pro include all versions prior to the vendor patch, specifically from n/a through 3.3.3. Organizations using these versions should take immediate action to secure their environments.
Mitigation & Remediation
To mitigate this vulnerability, organizations should ensure to patch to the latest version of Chaty Pro. If a patch is not yet available, implementing strict upload file type validation and limiting file types allowed for upload can help reduce the attack surface.
Additionally, organizations should consider employing penetration testing services to identify potential weaknesses in their systems.
Detection Guidance
Organizations should monitor for unusual file upload patterns and review logs for any unauthorized file uploads. Additionally, alerts should be configured for changes in web server configurations or unexpected file types being uploaded.
AppSecure Threat Intelligence Insight
CVE-2025-26776 exemplifies the critical nature of unrestricted file upload vulnerabilities in web applications. This vulnerability highlights the importance of robust input validation mechanisms and regular security assessments.
Security teams should engage in continuous learning about emerging threats and ensure their applications are resilient against such vulnerabilities. For further guidance on application security, organizations can refer to vulnerability management programs and implement proactive measures to secure their web environments.
Additionally, understanding and applying best practices for secure coding can drastically reduce the occurrence of such vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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