CVE-2010-0757 in WikyBlog
Summary
by MITRE
Unrestricted file upload vulnerability in index.php/Attach in WikyBlog 1.7.3rc2 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension using the uploadform action, then accessing it via a direct request to the file in userfiles/[username]/uploaded/.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/01/2026
The vulnerability identified as CVE-2010-0757 represents a critical unrestricted file upload flaw in WikyBlog version 1.7.3rc2 that enables remote authenticated attackers to achieve arbitrary code execution. This vulnerability exists within the index.php/Attach component of the blogging platform where the application fails to properly validate file extensions during the upload process. The flaw specifically manifests when users with valid authentication credentials attempt to upload files through the uploadform action, creating a pathway for malicious file execution.
The technical implementation of this vulnerability stems from inadequate input validation and sanitization within the file upload mechanism. When authenticated users submit files via the uploadform action, the system does not sufficiently verify the file types being uploaded, allowing attackers to bypass security restrictions by using executable extensions such as .php, .asp, .jsp, or other server-side script extensions. The vulnerability is particularly dangerous because it operates within the context of authenticated users, meaning that attackers must first obtain valid login credentials, but once they have access, they can execute arbitrary code on the server.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and potential data breaches. Attackers can upload malicious files that, when accessed through direct requests to userfiles/[username]/uploaded/, can execute arbitrary commands on the target server. This allows for privilege escalation, data exfiltration, and the establishment of persistent backdoors. The vulnerability aligns with CWE-434 which specifically addresses "Unrestricted Upload of File with Dangerous Type" and represents a significant weakness in the application's security architecture that violates fundamental principles of secure file handling and access control.
The attack vector for this vulnerability requires an authenticated user session, making it less likely to be exploited by casual attackers but still poses a serious threat in environments where insider threats exist or where credentials may be compromised through social engineering or other means. The vulnerability can be exploited through the uploadform action in the Attach component, and once successful, attackers can directly access uploaded files through the userfiles/[username]/uploaded/ directory structure. This direct access pattern makes it particularly effective for maintaining persistence and executing malicious payloads without detection, as the files appear to be legitimate user uploads.
Mitigation strategies for this vulnerability should focus on implementing robust file validation mechanisms that prevent the upload of executable files regardless of their extensions. Organizations should implement strict file type checking, including MIME type verification, and employ content inspection techniques to identify potentially malicious files. The system should enforce a whitelist approach for allowed file extensions and reject any uploads that do not meet predetermined security criteria. Additionally, uploaded files should be stored in a location that is not directly accessible via web requests, and proper access controls should be implemented to prevent unauthorized execution of uploaded content. This vulnerability demonstrates the critical importance of secure file handling practices and the necessity of implementing multiple layers of defense to protect against unauthorized code execution attacks. The remediation process should include immediate patching of the affected WikyBlog version and comprehensive security reviews of all file upload mechanisms within the application.