CVE-2026-28570 in Vavo Core Plugin
Summary
by MITRE • 08/18/2026
Unauthenticated Local File Inclusion in Vavo Core <= 2.3.0 versions.
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Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified as an unauthenticated local file inclusion flaw within Vavo Core versions prior to or equal to 2.3.0 represents a critical security deficiency that allows attackers to read arbitrary files from the underlying server operating system without requiring valid credentials. This type of vulnerability typically arises when web applications fail to properly sanitize user-supplied input before using it as an argument for file inclusion functions, such as PHP's include or require statements. In this specific context, the application accepts parameters directly related to file paths and incorporates them into internal logic that determines which resource files are loaded during runtime execution. Because the vulnerability is unauthenticated, any remote actor with network access to the target system can exploit it, significantly lowering the barrier for entry compared to vulnerabilities requiring prior authentication or privilege escalation.
From a technical perspective, this flaw aligns closely with CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program and falls under the broader category of CWE-434 Unrestricted Upload of File with Dangerous Type if file upload is involved, though here the primary vector is direct inclusion rather than upload. The attacker constructs a malicious URL or HTTP request where specific parameters are manipulated to point towards sensitive system files such as /etc/passwd on Linux systems or configuration files containing database credentials and API keys. By leveraging directory traversal sequences like ../ in the input parameter, the adversary can escape the intended application directory structure and access files located elsewhere in the file hierarchy. This capability enables the extraction of confidential data that was never intended to be exposed through web interfaces, effectively bypassing standard access controls designed to protect sensitive information.
The operational impact of this vulnerability is severe, as it serves as a potent initial vector for deeper system compromise. Once an attacker successfully reads critical configuration files or source code, they can extract hardcoded secrets such as database passwords, encryption keys, and third-party API tokens. This information often allows the adversary to pivot into other parts of the infrastructure, access backend databases directly, or impersonate legitimate users by decrypting session data if weak cryptographic methods are employed. Furthermore, in some configurations, local file inclusion vulnerabilities can be chained with remote code execution techniques if the application includes files that contain executable content or if the attacker can write malicious content to a log file and then include it, although this specific description focuses on read access. The exposure of internal architecture details also aids attackers in crafting more targeted attacks against other components within the same network segment.
To mitigate this vulnerability, immediate action is required by upgrading Vavo Core to version 2.3.1 or later where these input validation mechanisms have been corrected. In scenarios where an upgrade is not immediately feasible, administrators should implement strict allowlisting for all file inclusion parameters, ensuring that only predefined and expected filenames can be processed by the application logic. Additionally, disabling dangerous PHP functions such as include and require in production environments via php.ini settings or using open_basedir restrictions can limit the scope of files accessible to the web server process. Web Application Firewalls may also provide a temporary layer of defense by detecting common directory traversal patterns in HTTP requests, though this should not be relied upon as a primary control given that WAFs are prone to bypasses and configuration errors. Regular security audits and static code analysis tools focused on input validation practices are recommended to prevent similar flaws from being introduced into the application codebase in future development cycles.