CVE-2026-85634 in Fuse
Summary
by MITRE • 10/15/2026
A flaw was found in the ContentRepositoryImpl.copyExplodedContent function of the wildfly-core library, which is used by WildFly and JBoss EAP to manage server deployments. The issue occurs when the library processes an unsanitized deployment name. Due to a missing containment check, an attacker with the Deployer RBAC role can use path traversal sequences to access files outside the restricted deployment directory. This can allow the attacker to delete arbitrary directories or create files with arbitrary content, leading to a full privilege escalation to the management SuperUser role.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified in the ContentRepositoryImpl.copyExplodedContent function within the wildfly-core library represents a critical security flaw affecting WildFly and JBoss EAP application servers. This component is responsible for managing server deployments, specifically handling the copying of exploded content during deployment processes. The root cause lies in the insufficient validation of user-supplied input, particularly when processing deployment names provided by users with specific administrative privileges. When an attacker possessing the Deployer role submits a request containing path traversal sequences such as dot-dot-slash patterns, the system fails to properly sanitize or contain these inputs within the designated deployment directory structure. This lack of containment allows the underlying file operations to escape the intended sandboxed environment and interact with arbitrary locations on the server's filesystem.
From a technical perspective, this flaw is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which describes vulnerabilities where software does not properly neutralize special elements that can cause paths to transition outside of restricted directories. The absence of rigorous input validation enables an attacker to manipulate file system operations beyond the scope intended by the application logic. By leveraging these path traversal techniques, the malicious actor gains the ability to write files or delete directories in locations accessible to the user account running the WildFly process. This capability fundamentally undermines the isolation mechanisms designed to protect server integrity and data confidentiality during deployment activities.
The operational impact of this vulnerability is severe due to its potential for privilege escalation. Although the initial access requires only the Deployer role, which typically has limited permissions compared to full administrative rights, the ability to write arbitrary files or delete critical system directories can be exploited to achieve a full compromise of the server environment. An attacker could deploy malicious scripts, modify configuration files, or overwrite executable binaries with controlled content. These actions facilitate lateral movement and ultimately lead to privilege escalation to the management SuperUser role. This transition from a restricted deployment capability to unrestricted administrative control allows for complete takeover of the application server, potentially exposing sensitive data, disrupting services, or using the compromised host as a pivot point for further network attacks.
In alignment with industry threat modeling frameworks, this vulnerability maps to MITRE ATT&CK techniques related to Defense Evasion and Privilege Escalation. Specifically, it aligns with T1083: File and Directory Discovery if used to enumerate system structures, but more critically with T1564: Hidden Files and Directories or T1204: User Execution if the attacker utilizes created files for persistence or execution. The exploitation path demonstrates how a seemingly minor input validation oversight in an administrative function can be leveraged to bypass role-based access controls (RBAC) effectively. This highlights the importance of strict adherence to secure coding practices, particularly regarding file system interactions and permission management within enterprise application servers.
To mitigate this risk, immediate remediation should focus on applying vendor-provided patches that address the input validation logic in the copyExplodedContent function. Administrators must ensure they are running versions of WildFly or JBoss EAP where this flaw has been corrected. In addition to patching, organizations should enforce strict RBAC policies by ensuring that only trusted personnel hold the Deployer role and implementing network-level access controls to restrict management interfaces from untrusted networks. Regular audits of deployment scripts and input validation mechanisms are also recommended to prevent similar path traversal issues in other components. Monitoring for unusual file system activity or unauthorized changes to configuration files can aid in early detection of exploitation attempts before full privilege escalation occurs.