CVE-2026-108591 in InnoShop
Summary
by MITRE • 10/10/2026
InnoShop 0.9.2 contains a local file disclosure vulnerability that allows authenticated administrators with files_create permission to read server files by abusing the AI Core MCP file_upload tool's source argument. Attackers can supply file:// or php:// stream wrappers passed to file_get_contents(), storing contents on the public media disk to expose the .env file with APP_KEY and database credentials.
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Analysis
by VulDB Data Team • 10/10/2026
InnoShop version 0.9.2 is susceptible to a critical local file disclosure vulnerability that stems from improper input validation within its AI Core MCP module, specifically affecting the file_upload tool's source argument. This flaw permits authenticated administrators who possess files_create permissions to read arbitrary server-side files by exploiting PHP stream wrappers such as file:// and php://. The underlying technical mechanism involves passing these maliciously crafted URLs directly into a call for file_get_contents() without adequate sanitization or restriction of allowed protocols. By leveraging this capability, an attacker can bypass standard access controls designed to restrict file operations to the application's designated directories, effectively turning a legitimate administrative function into a vector for sensitive data exfiltration.
The operational impact of this vulnerability is severe due to the high privilege level required and the sensitivity of the exposed information. An authenticated administrator with the specific files_create permission can construct requests that instruct the server to read local system files or execute PHP code via stream wrappers, then store the resulting content on a publicly accessible media disk. This action directly leads to the exposure of critical configuration files, most notably the .env file which typically contains application secrets such as APP_KEY and database credentials including usernames and passwords. The compromise of these credentials allows for further lateral movement within the infrastructure, potential data breaches involving customer information stored in the database, and complete takeover of the web application's administrative functions if session management or password reset mechanisms are also compromised by the leaked keys.
From a classification perspective, this vulnerability aligns with CWE-200: Information Exposure, as it results in the unauthorized disclosure of sensitive system data to an authenticated user who should not have access to such low-level file contents. It also relates closely to CWE-732: Incorrect Permission Assignment for Critical Resource, reflecting the failure to restrict the scope of the file_upload tool's source parameter to safe, application-specific paths only. In terms of attack tactics, this exploit maps to MITRE ATT&CK technique T1083: File and Directory Discovery, where an adversary explores the target system to locate specific files for subsequent exploitation or data staging. The use of stream wrappers like php:// further touches upon aspects of code injection principles found in CWE-94 if the attacker attempts to execute arbitrary PHP code through crafted inputs, although the primary impact here is information disclosure rather than remote code execution.
Mitigation strategies must focus on strict input validation and secure coding practices within the InnoShop application framework. Developers should implement a whitelist approach for file paths, ensuring that only files located within predefined, safe directories can be processed by the upload tool. It is essential to disable or restrict the use of dangerous PHP stream wrappers such as php:// and file:// in functions like file_get_contents() unless absolutely necessary and heavily sanitized. Additionally, implementing path canonicalization checks before processing any user-supplied filenames can prevent directory traversal attacks that often accompany this type of vulnerability. For immediate remediation, administrators should apply security patches provided by the vendor if available, or manually restrict files_create permissions to only those users who strictly require them while monitoring logs for suspicious file access patterns involving stream wrappers.