CVE-2026-93352 in Laravel-Mediable
Summary
by MITRE • 09/24/2026
Laravel-Mediable 7.0.0 before 7.0.2 contains an incomplete patch for CVE-2026-49972 in which the .pht extension is absent from the forbidden_extensions blocklist in config/mediable.php. The blocklist introduced to address CVE-2026-49972 includes phpt but omits pht, which Apache executes as PHP via the default FilesMatch directive on Debian and Ubuntu systems. An attacker can upload a .pht file that passes all validation in MediaUploader::verifyExtension() and File::sanitizeFileName() because pht is not present in the blocklist, causing the file to be written to disk and executed as PHP when requested, enabling remote code execution with the privileges of the web server process.
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Analysis
by VulDB Data Team • 09/24/2026
The vulnerability identified in Laravel-Mediable versions prior to 7.0.2 represents a critical failure in input validation logic related to file extension filtering. This issue is an incomplete remediation for CVE-2026-49972, where the developers attempted to mitigate arbitrary code execution by restricting executable file extensions but failed to account for all variants recognized by common web server configurations. Specifically, while the configuration blocklist in config/mediable.php was updated to include phpt, it omitted pht. This oversight is significant because many production environments running on Debian or Ubuntu systems utilize Apache with default FilesMatch directives that treat .pht files as PHP scripts. Consequently, an attacker can bypass the intended security controls by uploading a file with the .pht extension, which passes through the MediaUploader::verifyExtension and File::sanitizeFileName checks without triggering any rejection mechanisms.
From a technical perspective, this flaw allows for remote code execution due to improper neutralization of user input before storage or use. The application accepts the uploaded file based on its name but fails to validate that the extension is not associated with executable server-side script processing in the target environment. When an attacker uploads a malicious .pht file containing PHP code, the web server interprets and executes this content upon request. This results in arbitrary command execution under the context of the web server process, such as www-data or apache2, granting the attacker significant control over the underlying system. The impact is severe, potentially leading to full compromise of the application infrastructure, data exfiltration, lateral movement within the network, and persistence mechanisms established through backdoors embedded in these uploaded scripts.
This vulnerability aligns with CWE-434, which describes unrestricted upload of file with dangerous type, as well as CWE-94, improper control of generation of code or CGI, highlighting the failure to restrict input that could be interpreted as executable code by a server component. In terms of attack vectors and tactics, this scenario maps directly to ATT&CK technique T1505.003, Server Side Scripting Web Shell, where attackers upload web shells to gain persistent access. The exploitation path involves initial file upload followed by remote execution via the web server's native parsing capabilities rather than direct application logic flaws in PHP code interpretation alone.
To mitigate this vulnerability, organizations must immediately upgrade Laravel-Mediable to version 7.0.2 or later, which includes the corrected blocklist containing pht alongside other dangerous extensions such as phar and php. For environments where upgrading is not immediately feasible, administrators should implement additional server-side restrictions using Apache mod_rewrite rules or Nginx configuration directives to explicitly deny execution of .pht files regardless of application-level validation. Furthermore, it is advisable to configure the web server to treat all uploaded directories with no-execution permissions and to employ strict Content Security Policies that prevent inline script execution where possible. Regular audits of file upload mechanisms against evolving threat landscapes are essential to ensure comprehensive protection against similar bypass techniques in future updates.