CVE-2026-108706 in eladmin
Summary
by MITRE • 10/11/2026
eladmin through commit 55fbf70 contains a missing authorization vulnerability in the downloadS3Storage handler that allows any authenticated user to retrieve stored object URLs without storage permissions. Attackers can enumerate sequential ids against GET /api/s3Storage/download/{id} to collect URLs of all uploaded objects, exposing file contents on publicly readable buckets.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 10/11/2026
The vulnerability identified in eladmin through commit 55fbf70 represents a critical failure in access control mechanisms within the S3 storage management module. Specifically, the downloadS3Storage handler fails to verify whether the authenticated user possesses the necessary permissions to access the specific object being requested. This architectural flaw allows any validly authenticated user, regardless of their role or assigned privileges, to retrieve presigned URLs for stored objects by simply providing a sequential identifier in the request path. The endpoint GET /api/s3Storage/download/{id} serves as the vector for this exploitation, where the system generates and returns a URL that grants direct access to the underlying cloud storage object without checking if the requester is authorized to view it.
This missing authorization issue effectively bypasses the intended security boundaries of the application layer, leading to an unauthorized data exposure scenario. By exploiting this flaw, attackers can perform enumeration attacks against sequential identifiers to systematically collect URLs for all uploaded objects within the system. This capability transforms a simple authentication requirement into a significant risk factor, as it enables the aggregation of sensitive files that were not intended for public or unrestricted access. The impact is particularly severe when these storage buckets are configured with publicly readable permissions, although even private buckets can be compromised if the presigned URLs have sufficient validity periods and scopes to allow download operations by unauthorized parties.
From a technical classification perspective, this vulnerability aligns directly with CWE-284, which describes Improper Access Control, specifically highlighting failures in verifying user privileges before granting access to resources. Furthermore, it maps to MITRE ATT&CK technique T1078, Valid Accounts, as the attacker leverages legitimate credentials to perform unauthorized actions that are typically restricted by role-based or attribute-based policies. The ability to enumerate sequential IDs also touches upon CWE-200, Exposure of Sensitive Information to an Unauthorized Actor, and potentially CWE-359 if the enumeration leads to further reconnaissance activities within the environment.
The operational impact of this vulnerability extends beyond simple data leakage. It undermines the integrity of the application's security model by demonstrating that authentication does not equate to authorization in this specific context. Organizations relying on eladmin for document management or file storage face significant risks including compliance violations, intellectual property theft, and exposure of personally identifiable information if such data is stored within the affected S3 buckets. The ease of exploitation via sequential ID enumeration means that automated tools can rapidly harvest large volumes of sensitive files with minimal effort once valid credentials are obtained through phishing, credential stuffing, or other initial access vectors.
To mitigate this vulnerability, immediate remediation should focus on implementing robust authorization checks within the downloadS3Storage handler. Developers must ensure that every request to retrieve a storage object URL verifies not only that the user is authenticated but also that they have explicit permission associated with their role or specific ownership of the target resource. This can be achieved by integrating existing access control lists or policy engines into the service layer before generating presigned URLs. Additionally, implementing non-sequential identifiers such as UUIDs for storage objects would significantly hinder enumeration attacks, although this should not replace proper authorization checks. Regular security audits and penetration testing focusing on broken object level authorization are recommended to detect similar flaws in other parts of the application infrastructure.