CVE-2026-108688 in eladmin
Summary
by MITRE • 10/11/2026
Eladmin through 2.7 contains a missing authorization vulnerability in the LocalStorageController uploadPicture handler that allows low-privileged authenticated users to bypass the storage:add permission. Attackers can send POST requests with image-named files to /api/localStorage/pictures to write files into server local storage and disclose absolute server paths.
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Analysis
by VulDB Data Team • 10/11/2026
The Eladmin framework, specifically through version 2.7, contains a critical missing authorization vulnerability within the LocalStorageController component. This flaw resides in the uploadPicture handler method, which is designed to manage image file uploads for application assets. The core technical deficiency involves an incomplete access control check that fails to verify whether the authenticated user possesses the necessary storage:add permission before processing the incoming request. Consequently, any low-privileged authenticated user who has valid credentials can bypass these security restrictions and execute unauthorized write operations against the server's local filesystem.
From a technical perspective, this vulnerability stems from improper implementation of role-based access control mechanisms within the backend logic. When an attacker sends a POST request to the /api/localStorage/pictures endpoint with image-named files, the application accepts the input without validating the user's permission set against the required storage:add privilege. This lack of enforcement allows malicious actors to upload arbitrary content directly into directories that are typically restricted or intended for administrative use only. The vulnerability is particularly dangerous because it does not require authentication bypass in terms of login credentials; rather, it exploits a logical flaw where existing valid sessions can be leveraged to perform actions outside their authorized scope.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads. Attackers who exploit this weakness can write files into the server's local storage, which may lead to further compromise scenarios such as remote code execution if the uploaded content is subsequently processed or served by other components. Additionally, the exploitation often results in the disclosure of absolute server paths. This information leakage provides attackers with valuable intelligence about the underlying operating system and directory structure, facilitating more targeted attacks like path traversal or local file inclusion exploits. The ability to write files also poses a risk of defacement or planting malicious scripts if those directories are accessible via web routes.
This vulnerability aligns closely with CWE-269, which describes Improper Privilege Management, as the system fails to enforce appropriate access levels for specific functions. Furthermore, it relates to CWE-434, Unrestricted Upload of File with Dangerous Type, given that arbitrary files can be stored on the server. In terms of adversary tactics, this behavior corresponds to ATT&CK technique T1508, Exploitation of Remote Services, specifically through unauthorized access and data exfiltration or manipulation via web applications. The lack of strict permission checks represents a fundamental failure in implementing secure design principles outlined in OWASP guidelines for API security.
To mitigate this vulnerability, developers must immediately implement robust authorization checks within the LocalStorageController's uploadPicture method. This involves verifying that the authenticated user holds the specific storage:add permission before allowing any file write operations to proceed. It is also recommended to enforce strict input validation and sanitization on all uploaded files to prevent malicious content execution. Additionally, applying the principle of least privilege ensures that users only have access to resources necessary for their role. Regular security audits and static code analysis tools should be employed to detect similar authorization flaws across other endpoints in the Eladmin framework. Updating to a patched version where these checks are properly enforced is essential for maintaining system integrity and preventing unauthorized data manipulation or disclosure.