CVE-2026-75328 in DocSys
Summary
by MITRE • 08/27/2026
In DocSys-master V2.02.85, the downloadDocEx interface in src/com/DocSystem/controller/DocController.java has an arbitrary file read vulnerability:
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Analysis
by VulDB Data Team • 08/27/2026
The identified vulnerability resides within the DocSys-master application version 2.02.85, specifically affecting the downloadDocEx endpoint implemented in the Java source file located at src/com/DocSystem/controller/DocController.java. This component is responsible for handling document retrieval requests from clients, a critical function that requires strict validation of user-supplied input to prevent unauthorized access to server-side resources. The flaw represents a classic instance of an insecure direct object reference or path traversal issue, where the application fails to adequately sanitize or validate the file path provided by the requester before processing it for download operations.
Technically, the vulnerability stems from insufficient input validation mechanisms within the controller logic. When a user submits a request containing a filename parameter, the system likely concatenates this value directly with a base directory path without checking for malicious sequences such as dot-dot-slash (../) or absolute paths that escape the intended document root. This lack of normalization allows an attacker to manipulate the file path argument to traverse up the filesystem hierarchy and access files outside the designated web-accessible directories. By carefully crafting requests, an adversary can read arbitrary files from the server's operating system, including configuration files containing database credentials, private keys, or other sensitive internal data that should remain isolated from public-facing interfaces.
The operational impact of this vulnerability is severe, as it enables unauthorized information disclosure with potentially catastrophic consequences for organizational security posture. An attacker leveraging this flaw can exfiltrate sensitive proprietary documents, steal user personal identifiable information if stored in accessible locations, and retrieve backend configuration files that may expose database connection strings or API keys. This access serves as a significant foothold for further exploitation, allowing the adversary to map internal network structures, identify additional vulnerabilities within connected systems, or potentially escalate privileges by reading credential stores. The ability to read arbitrary files undermines the confidentiality integrity of the entire application ecosystem and violates fundamental security principles regarding data isolation and access control boundaries.
From an industry standard perspective, this vulnerability aligns with CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which categorizes flaws where software does not properly neutralize special elements within file paths that can cause the path to resolve to directories outside of the restricted set. Additionally, in terms of tactical classification under the MITRE ATT&CK framework, this behavior corresponds to T1083: File and Directory Discovery, a technique used by adversaries to gather information about the target environment prior to data exfiltration or lateral movement. The exploitation method also reflects CWE-20: Improper Input Validation, highlighting the failure to enforce constraints on user-supplied data before processing.
To mitigate this vulnerability, immediate remediation efforts should focus on implementing robust input validation and path canonicalization techniques within the DocController.java module. Developers must ensure that all file paths are resolved to their absolute forms using standard library functions such as java.nio.file.Paths.get().normalize() or similar mechanisms in other languages, which effectively removes redundant elements like dot-dot-slash sequences before any filesystem operations occur. Furthermore, it is essential to enforce a strict allowlist approach where only specific, predefined filenames or identifiers are permitted for download requests rather than accepting arbitrary path strings. Implementing chroot-like sandboxing concepts by restricting the application's effective working directory can also provide an additional layer of defense against traversal attacks. Regular security code reviews and integration of static analysis tools that detect path manipulation flaws into the development lifecycle will help prevent similar issues from being introduced in future updates, ensuring long-term resilience against information disclosure threats.