CVE-2026-115709 in Cloud Enterprise
Summary
by MITRE • 10/29/2026
Improper Link Resolution Before File Access ('Link Following') (CWE-59) in Elastic Cloud Enterprise (ECE) can lead to unauthorized disclosure and loss of data belonging to other deployments on the same host via Symlink Attack (CAPEC-132).
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified as CWE-59, commonly known as Improper Link Resolution Before File Access or symlink following, represents a critical class of security flaws where an application fails to properly validate symbolic links before performing file system operations. In the specific context of Elastic Cloud Enterprise (ECE), this flaw manifests when the software does not adequately verify that a requested file path resolves exclusively within its intended directory structure prior to reading or writing data. This lack of rigorous validation allows an attacker to exploit the operating system's handling of symbolic links, which are special files that act as pointers to other files or directories on the disk. By creating a malicious symlink that points outside the restricted application sandbox, an adversary can trick ECE into accessing sensitive resources it was not intended to reach, effectively bypassing access controls and isolation mechanisms designed to protect multi-tenant environments.
The operational impact of this vulnerability is severe due to its potential for unauthorized disclosure and data loss across different deployments hosted on the same physical or virtual host. Elastic Cloud Enterprise operates as a platform-as-a-service solution where multiple customers may have their clusters running concurrently on shared infrastructure. If an attacker gains access to one deployment, even with limited privileges, they can leverage this symlink vulnerability to traverse the file system boundaries. This allows them to read configuration files, logs, or data belonging to other tenants who share the underlying host resources. Such cross-tenant data leakage violates fundamental security principles of isolation and confidentiality, potentially exposing proprietary business logic, customer personal information, or sensitive operational metrics to unauthorized parties. The attack vector aligns with CAPEC-132, Symlink Attack, which details how attackers manipulate symbolic links to redirect file operations to unintended targets.
From a technical perspective, the root cause lies in the application's failure to canonicalize paths correctly before access checks occur. When ECE processes a request involving a file path containing symlink components, it must resolve these links and verify that the final resolved target resides within an allowed directory tree. If this check is performed after the link resolution or if the initial validation only checks the un-resolved path, the application becomes susceptible to race conditions or simple redirection attacks. An attacker can create a symbolic link in a writable directory managed by ECE, pointing it to a sensitive location such as /etc/shadow on Linux systems or other tenant data directories within the cluster's storage volume. When an administrative function or background process accesses this path without proper verification, it inadvertently reads or modifies the target file, leading to information disclosure or potential system compromise depending on the specific operation performed.
Mitigation strategies for this vulnerability require a multi-layered approach focusing on strict input validation and secure coding practices. Developers must ensure that all file paths are canonicalized using standard library functions before any access control checks are applied. This involves resolving symbolic links, normalizing path separators, and verifying that the resulting absolute path starts with the expected base directory prefix. Additionally, implementing operating system-level restrictions such as chroot jails or container isolation can provide a defense-in-depth layer, limiting the impact even if application-level validation fails. For administrators using Elastic Cloud Enterprise, it is crucial to ensure that all patches provided by Elasticsearch are applied promptly to address this specific flaw. Regular security audits and static code analysis tools configured to detect CWE-59 patterns should also be integrated into the development lifecycle to prevent similar issues in future releases.