This vulnerability allows arbitrary file deletion in ConvertX, a self-hosted online file converter. Specifically, in versions prior to 0.17.0, the `POST /delete` endpoint improperly processes a user-controlled `filename` value to create a filesystem path, using `unlink` to delete files without adequate validation. By leveraging path traversal sequences, such as `../`, attackers can delete files outside the intended uploads directory, constrained only by the server process's permissions.
The vulnerability has been assigned a CVSS score of 8.1, categorizing it as high severity. This classification indicates significant risk to organizations, as attackers may exploit this flaw to delete critical files, potentially leading to data loss and service disruption. The urgency for defenders is heightened due to the ease of exploitation—requiring only low privileges and no user interaction.
Organizations should prioritize patching immediately. Version 0.17.0 of ConvertX addresses this vulnerability, eliminating the insecure handling of file deletions. Failure to upgrade could result in severe operational impacts, making it imperative to evaluate your systems for affected versions.
The disclosure date for this vulnerability was January 27, 2026. Given its high severity score and the potential for exploitation, it is critical for organizations utilizing ConvertX to implement the necessary updates without delay.
Vulnerability Details
The vulnerability specifically affects ConvertX versions prior to 0.17.0, where the user-controlled filename can lead to arbitrary file deletion. The vulnerability is classified under CWE-22, which pertains to improper limitation of a pathname to a restricted directory.
The CVSS score of 8.1 indicates a high risk, with a vector string of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H, highlighting that the attack vector is network-based, the complexity is low, and only low privileges are required for exploitation.
Technical Analysis
The root cause of this vulnerability is the lack of sufficient validation on user input for the `POST /delete` endpoint. The application constructs a filesystem path directly from the provided filename without sanitizing or validating the input adequately, allowing attackers to exploit the functionality to delete arbitrary files.
The attack vector is network-based, meaning that an attacker can exploit this vulnerability remotely. The attack complexity is rated as low, and only low-level privileges are necessary to execute the attack, posing a significant risk to organizations.
No user interaction is required, and the impacts of the vulnerability are severe concerning integrity and availability, as unauthorized file deletions can compromise critical data and system functionality.
Risk & Impact Analysis
Risk to organizations includes the potential loss of critical files due to unauthorized deletions, leading to operational disruptions and data integrity issues. The blast radius of this vulnerability can be extensive, affecting not only the files within the uploads directory but potentially other system files, depending on the server's permissions.
Given the CVSS score and the active exploitation potential demonstrated through its characteristics, organizations should assess their exposure and urgency. The absence of public exploits does not diminish the risk, as the technical simplicity of the attack presents a clear threat.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All ConvertX versions prior to 0.17.0 are affected. Organizations should ensure they upgrade to version 0.17.0 or later to mitigate this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations must upgrade to ConvertX version 0.17.0 or later. If immediate upgrading is not feasible, consider implementing workaround solutions such as restricting access to the `POST /delete` endpoint and validating filename inputs to prevent path traversal attacks.
Additionally, organizations may benefit from conducting a thorough security assessment to evaluate the presence of similar vulnerabilities within their applications. For a comprehensive approach to security, consider application security assessments that identify and mitigate potential risks.
Detection Guidance
Monitoring for unusual file deletions and access patterns is crucial for detecting potential exploitation of this vulnerability. Organizations should implement logging mechanisms that capture events related to file operations, particularly around the `POST /delete` endpoint.
Behavioral anomalies indicating unauthorized access or deletion attempts should also be flagged. Additionally, monitoring server logs for unusual access patterns can help identify potential intrusions.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its demonstration of inadequate input validation within web applications. Such weaknesses can lead to severe consequences, as seen in this case with arbitrary file deletion.
This incident serves as a pattern indicating the necessity for robust validation mechanisms to safeguard against common attack vectors like path traversal. Security teams are encouraged to adopt best practices in input handling and conduct regular security audits.
For further insights on strengthening application security, organizations should review best practices outlined in penetration testing methodology and regularly update their security strategies to adapt to evolving threats.
Furthermore, organizations should consider integrating continuous security assessments into their development lifecycle to proactively identify vulnerabilities. Engaging in continuous penetration testing can greatly enhance their security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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