CVE-2015-8399 in Confluence
Summary
by MITRE
Atlassian Confluence before 5.8.17 allows remote authenticated users to read configuration files via the decoratorName parameter to (1) spaces/viewdefaultdecorator.action or (2) admin/viewdefaultdecorator.action.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/22/2025
The vulnerability CVE-2015-8399 represents a critical information disclosure flaw in Atlassian Confluence software versions prior to 5.8.17. This vulnerability specifically targets the decorator configuration functionality within the application's administrative interface, exposing sensitive system information to authenticated attackers who may not possess elevated privileges. The flaw exists in the way Confluence processes the decoratorName parameter, which is used to determine which decorator template should be applied to view pages or spaces. When an attacker sends a specially crafted request containing a malicious decoratorName parameter to either the spaces/viewdefaultdecorator.action or admin/viewdefaultdecorator.action endpoints, the application fails to properly validate the input and instead returns the contents of configuration files that should remain protected from unauthorized access.
The technical exploitation of this vulnerability relies on the improper input validation mechanism within Confluence's action handling system. According to CWE-20, this vulnerability stems from insufficient validation of input parameters, specifically allowing path traversal or file inclusion attacks through the decoratorName parameter. The flaw enables an authenticated user to manipulate the decoratorName parameter to access configuration files that contain sensitive information such as database connection details, encryption keys, and system configurations. The vulnerability is particularly concerning because it allows users with basic authentication credentials to escalate their access level by reading files that typically require administrative privileges to access. The attack vector operates through the web application's interface, where the decoratorName parameter is processed without adequate sanitization or authorization checks, making it possible for an attacker to extract system configuration data that could be used for further exploitation.
The operational impact of CVE-2015-8399 extends beyond simple information disclosure, as the leaked configuration files often contain critical system data that could facilitate more sophisticated attacks. The exposure of database connection strings, API keys, and system properties provides attackers with the necessary information to conduct database attacks, perform credential stuffing, or escalate privileges within the Confluence environment. This vulnerability aligns with ATT&CK technique T1083, which describes the discovery of system information through the enumeration of files and directories, and T1566, which covers the use of malicious file content to gain access to systems. The configuration files accessed through this vulnerability may also contain sensitive data that violates compliance requirements under standards such as PCI DSS, HIPAA, and SOX, making organizations vulnerable to regulatory penalties and audit failures.
Organizations affected by this vulnerability should immediately implement the remediation measures recommended by Atlassian, including upgrading to Confluence version 5.8.17 or later, which contains the necessary patches to address the input validation flaw. The patch resolves the issue by implementing proper parameter validation and access controls for the decoratorName parameter, ensuring that only authorized users with appropriate permissions can access configuration files through the decorator functionality. Additionally, network segmentation and access control measures should be implemented to limit the exposure of Confluence servers to untrusted networks, while monitoring systems should be configured to detect unusual access patterns that might indicate exploitation attempts. Security teams should also review and audit existing user permissions to ensure that unnecessary administrative privileges are not granted to users who do not require them, as this vulnerability could potentially be exploited by users with minimal privileges to access sensitive system information. The vulnerability demonstrates the importance of proper input validation and access control mechanisms in web applications, particularly in enterprise collaboration platforms where sensitive data is frequently processed and stored.