CVE-2026-84823 in WildFly
Summary
by MITRE • 10/16/2026
A flaw was found in WildFly. A user with the `Monitor` role, which is the lowest standard Role-Based Access Control (RBAC) role, can exploit a path traversal vulnerability in the `take-snapshot` operation. By manipulating the `name` parameter, this user can write a copy of the server configuration to an arbitrary location. This allows the `Monitor` role to read back the server configuration, including sensitive credentials, which would otherwise be restricted by RBAC, leading to information disclosure.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 10/16/2026
The vulnerability identified in WildFly represents a critical breakdown in access control mechanisms within its management interface, specifically affecting users assigned the Monitor role. This role is designed as the lowest level of standard Role-Based Access Control (RBAC), intended primarily for read-only monitoring purposes where administrative actions and sensitive data exposure should be strictly prohibited. The flaw resides in the take-snapshot operation, which allows a user to capture the current state of the server configuration. While this functionality is legitimate for diagnostic or backup purposes when executed by administrators with appropriate privileges, it fails to properly validate input parameters when accessed by lower-privileged users. Specifically, the name parameter used to specify the destination path for the snapshot file lacks sufficient sanitization against directory traversal sequences. This oversight enables an attacker to manipulate the file system path, bypassing intended restrictions on where configuration data can be written.
By injecting relative or absolute path traversal characters into the name parameter, a user with Monitor privileges can redirect the output of the take-snapshot operation to arbitrary locations within the server's file system that are typically inaccessible for writing by such low-privileged accounts. Once the snapshot is successfully written to an accessible location, the attacker gains the ability to read back this configuration file. Since WildFly stores sensitive information including database passwords, security realm credentials, and other authentication secrets in plain text or easily reversible formats within its configuration files, this action results in a severe compromise of confidentiality. The attacker effectively circumvents the RBAC model by exploiting the path traversal flaw to extract data that should remain protected from Monitor-level access, thereby achieving an unauthorized elevation of information disclosure privileges without requiring higher administrative rights.
From a technical classification perspective, this vulnerability aligns with CWE-22 Improper Limitation of a Pathname to a Restricted Directory and CWE-862 Missing Authorization. The core issue is not merely the ability to write files but the failure to enforce that only authorized roles can perform operations that expose sensitive configuration data. In terms of offensive security frameworks, this behavior maps directly to ATT&CK technique T1505.003 Server Software Component: Web Shell and potentially T1005 Data from Local System depending on how the extracted data is utilized for further lateral movement or credential stuffing attacks against other services using the same credentials found in the configuration files. The exploitation path relies heavily on social engineering or initial access to obtain Monitor-level API tokens, after which no additional authentication bypasses are required beyond manipulating the input parameter.
The operational impact of this vulnerability extends beyond simple information disclosure. Access to WildFly server configurations often reveals connection strings for backend databases such as PostgreSQL, MySQL, or Oracle, along with their respective credentials. It may also expose JMS queue definitions, EJB remote interfaces, and security domain mappings that define how applications authenticate against external identity providers like Active Directory or LDAP servers. If these credentials are reused across other systems within the enterprise network, the compromise of WildFly can serve as a pivot point for broader infrastructure takeover. Furthermore, because the Monitor role is often granted to automated monitoring tools or less privileged operational staff who may have legitimate access to management interfaces, the attack surface is significantly widened compared to vulnerabilities requiring admin-level access.
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The most effective short-term solution is to apply vendor-provided patches that restrict the take-snapshot operation exclusively to users with administrative privileges or explicitly deny path traversal inputs in the name parameter for all roles. Organizations should also review their RBAC policies to ensure that Monitor role assignments are strictly limited to essential personnel and automated systems that do not require access to management endpoints capable of triggering this flaw. Implementing a Web Application Firewall (WAF) ruleset to detect and block directory traversal patterns such as ../ or ..\ in API requests can provide an additional layer of defense-in-depth while patches are deployed. Additionally, auditing logs for unusual file system write operations originating from the WildFly process can help identify exploitation attempts in real-time. Long-term remediation should involve refactoring the management interface to enforce strict output path validation and ensuring that sensitive configuration data is encrypted at rest or abstracted through secure credential stores rather than stored directly in accessible XML files.