CVE-2026-78435 in Helpdesk
Summary
by MITRE • 08/25/2026
A vulnerability has been found in Faveo Helpdesk up to 2.0.3. Affected is the function unlink of the file app/Http/Controllers/Admin/helpdesk/SettingsController.php of the component Logo Handler. Such manipulation of the argument data1 leads to path traversal. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
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Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified in Faveo Helpdesk versions up to 2.0.3 represents a critical security flaw within the application's administrative interface, specifically targeting the Logo Handler component located at app/Http/Controllers/Admin/helpdesk/SettingsController.php. This issue stems from improper validation of user-supplied input passed to the unlink function, which is responsible for removing files from the server filesystem. The core technical failure lies in the lack of rigorous sanitization and path canonicalization before processing the data1 argument. By manipulating this parameter, an attacker can inject directory traversal sequences such as dot-dot-slash characters into the file path string. This manipulation allows the application to resolve paths outside of its intended web root or designated asset directories, effectively bypassing access controls that are typically enforced by restricting operations to specific subdirectories.
From a technical perspective, this flaw is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory. The vulnerability enables remote code execution scenarios indirectly through file system manipulation. Since the unlink function interacts directly with the operating system's file handling mechanisms without adequate boundary checks, an attacker can traverse up the directory hierarchy using relative path sequences. This capability is particularly dangerous because it allows for the deletion of arbitrary files on the server hosting the Faveo Helpdesk instance. The absence of input validation means that any authenticated user with access to the settings configuration page can exploit this logic error to target sensitive system files, configuration backups, or other critical application components stored in parent directories relative to the web root.
The operational impact of this vulnerability is severe due to its remote exploitable nature and the availability of public exploits. An attacker who has obtained valid credentials for an administrative account within Faveo Helpdesk can launch attacks from any network location without requiring physical access or local shell privileges on the target server. The disclosure that exploit code is publicly available significantly lowers the barrier to entry for malicious actors, increasing the likelihood of automated scanning and exploitation attempts against exposed instances. Furthermore, the fact that the project has not yet responded to early issue reports suggests a potential gap in security maintenance practices, leaving users vulnerable during the window between discovery and patch deployment. The ability to delete arbitrary files can lead to denial of service conditions by removing essential application assets or configuration files required for system stability.
In alignment with industry standards such as MITRE ATT&CK, this vulnerability facilitates techniques related to Defense Evasion and Impact categories, specifically file deletion which contributes to data destruction. To mitigate the immediate risk, administrators should restrict access to the administrative interface using strong authentication mechanisms and network-level controls if possible. It is critical to apply any available patches from the vendor immediately upon release. In the interim, implementing a Web Application Firewall with rules that detect and block directory traversal patterns in POST or GET parameters targeting settings endpoints can provide an additional layer of defense. Additionally, ensuring that the web server process runs under a restricted user account with minimal file system permissions can limit the damage caused by successful exploitation, preventing access to sensitive directories outside the application's designated scope. Regular audits of input validation logic across all controller functions are recommended to prevent similar path traversal issues in other parts of the application.