CVE-2026-84063 in BurgerEditor
Summary
by MITRE • 09/10/2026
BurgerEditor 3.2.0 through 3.4.0 contains an issue with unrestricted upload of file with dangerous type. If this vulnerability is exploited, an arbitrary file may be uploaded by an attacker who can log in to the product, potentially allowing arbitrary PHP code to be executed may be caused.
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Analysis
by VulDB Data Team • 09/10/2026
The vulnerability identified in BurgerEditor versions 3.2.0 through 3.4.0 represents a critical security flaw rooted in insufficient validation of file uploads within the application's content management interface. This issue is classified under CWE-434, which describes an unrestricted upload of a file with dangerous type. The core technical failure lies in the server-side processing logic that handles user-uploaded assets. When an authenticated user submits a file for storage or integration into their project, the system fails to adequately verify the file's MIME type against its actual content structure and does not enforce strict allow-listing mechanisms for executable script extensions such as PHP. Consequently, if an attacker successfully authenticates to the application, they can bypass standard security controls by uploading files with malicious payloads disguised under acceptable image or document extensions, or simply exploiting weak extension filtering that permits server-side execution of uploaded scripts.
The operational impact of this vulnerability is severe, primarily because it leads directly to Remote Code Execution (RCE). Once a PHP file containing arbitrary code is successfully uploaded and stored in a directory accessible by the web server, an attacker can trigger the execution of this script via a direct HTTP request. This allows the adversary to run commands with the privileges of the web application process, which often includes read and write access to sensitive data directories, database credentials, and potentially full control over the underlying operating system depending on the hosting environment's configuration. The requirement for authentication slightly mitigates the risk compared to unauthenticated exploits but does not eliminate it; any compromised user account or weak credential set can be leveraged by an attacker to initiate this upload chain. This aligns with MITRE ATT&CK technique T1505, specifically Server Software Component: Web Shell, where attackers install web shells to maintain persistent access and execute further commands on the target infrastructure.
To mitigate this vulnerability, immediate remediation actions should focus on upgrading BurgerEditor to a version beyond 3.4.0 where these input validation flaws have been addressed by the vendor. In cases where an upgrade is not immediately feasible, defensive measures must be implemented at both the application and infrastructure levels. Application-level mitigations include implementing strict file type verification using MIME magic bytes rather than relying solely on file extensions, ensuring that uploaded files are stored in non-executable directories with appropriate permissions to prevent direct script execution by the web server. Additionally, renaming uploaded files to random strings can prevent attackers from predicting URLs for their malicious payloads. Infrastructure-level controls should include configuring the web server, such as Nginx or Apache, to explicitly disable PHP execution in upload directories using directives like php_flag engine off or location blocks that deny access to script extensions. Regular security audits and penetration testing focused on file upload mechanisms are also recommended to identify similar weaknesses across other components of the application ecosystem.