CVE-2026-28152 in Tonda Core Plugin
Summary
by MITRE • 08/24/2026
Unauthenticated Local File Inclusion in Tonda Core < 2.6 versions.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified as an unauthenticated local file inclusion flaw within Tonda Core versions prior to 2.6 represents a critical security deficiency that allows attackers to read arbitrary files from the underlying server operating system without requiring valid credentials or authentication tokens. This type of vulnerability typically arises when web applications fail to properly validate, sanitize, or restrict user-supplied input used as part of file path operations. In the context of Tonda Core, which is a framework often utilized for building scalable backend services and APIs, this flaw suggests that an endpoint accepts parameters directly influencing filesystem access mechanisms without adequate boundary checks. An attacker can exploit this by manipulating request parameters to traverse directory structures using standard techniques such as dot-dot-slash sequences or null byte injections, depending on the specific server environment configuration. The absence of authentication requirements significantly lowers the barrier for exploitation, enabling any remote actor with network connectivity to interact with the vulnerable endpoint and extract sensitive data from the host system.
From a technical perspective, local file inclusion vulnerabilities are categorized under CWE-436, which refers to interpretation ambiguity in software development practices where input is not correctly interpreted or validated before being used by dangerous functions like include(), require(), fopen(), or similar filesystem APIs. The operational impact of this vulnerability extends beyond simple data exfiltration; it can serve as a stepping stone for more severe attacks such as remote code execution if the attacker can upload malicious files to accessible directories and subsequently trigger their inclusion, although in pure LFI scenarios without write access, the primary risk remains information disclosure. Sensitive files that are commonly targeted include configuration files containing database credentials, environment variables storing API keys or secret tokens, system logs revealing internal architecture details, and potentially sensitive user data if stored in plain text formats accessible via relative paths. The ability to read these files compromises the confidentiality integrity of the entire application stack, as attackers can harvest secrets necessary for further lateral movement within the network infrastructure.
This vulnerability aligns with several tactics defined in the MITRE ATT&CK framework, specifically relating to Collection and Discovery phases where adversaries seek to gather information about the target environment. Techniques such as T1083 File and Directory Discovery are directly applicable here, as the attacker uses the LFI mechanism to enumerate and access files that should be restricted by default permissions or application logic. Furthermore, if the included file contains executable code or is used in a context where server-side processing occurs, it may also relate to T1505 Server Software Component which involves loading malicious components into legitimate software processes. The lack of authentication means this vulnerability can be exploited via automated scanning tools that probe for common LFI patterns across large networks, making it a high-risk issue for any internet-facing deployment of Tonda Core versions below 2.6.
Mitigation strategies must focus on both immediate remediation and long-term defensive coding practices. The primary solution is to upgrade the Tonda Core framework to version 2.6 or later where this vulnerability has been addressed by developers through improved input validation and path normalization routines. If upgrading is not immediately feasible, administrators should implement strict allow-listing for file paths, ensuring that only predefined, expected files can be accessed via web endpoints. Additionally, configuring the web server to disable directory traversal sequences such as ../ in request parameters can provide a layer of defense-in-depth. It is also crucial to enforce principle of least privilege by running application processes with minimal filesystem permissions so that even if an inclusion occurs, the attacker cannot access critical system files outside the designated application root directory. Regular security audits and static code analysis tools should be employed to detect similar patterns in custom modules or extensions built upon Tonda Core to prevent recurrence of such flaws.