CVE-2025-21622 is a high-severity vulnerability affecting ClipBucket V5, an open-source video hosting platform developed by Oxygenz. The vulnerability arises during the user avatar upload workflow, where users can upload and change their avatars at any time. During the deletion process, ClipBucket inadequately checks the avatar_url for path traversal sequences, which allows attackers to manipulate the file path to delete files outside the intended avatars subdirectory. This flaw compromises the integrity of the system, leading to potential unauthorized file deletions.
The CVSS score for this vulnerability is 7.5, indicating a high level of risk. The attack vector is network-based, with low complexity and no privileges or user interaction required to exploit it. The potential impact on availability is significant, as attackers could delete critical files, rendering parts of the application inoperable. Due to the severity of this vulnerability and its potential impact, organizations are urged to prioritize patching.
This vulnerability is fixed in ClipBucket version 5.5.1 - 237, and it is crucial for organizations using affected versions to implement the update promptly. The lack of adequate input validation during file operations is a common risk factor in application security, emphasizing the need for robust validation mechanisms.
Organizations should act swiftly to mitigate the risks associated with CVE-2025-21622. The potential for unauthorized file deletions poses a significant threat to operational integrity and data confidentiality. Immediate action to patch affected systems is essential.
Vulnerability Details
The vulnerability is characterized as a path traversal vulnerability (CWE-22) that allows attackers to manipulate file paths through user input. This can result in arbitrary file deletion within the system, which is particularly dangerous if sensitive files are targeted. The CVSS vector string for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, which indicates a high severity with a potential for significant availability impact.
Technical Analysis
The root cause of the vulnerability lies in the user avatar upload process. When a user requests deletion of their avatar, ClipBucket checks if the specified avatar_url exists within the avatars directory. However, it fails to sanitize the input properly, allowing path traversal sequences to be injected. This means that an attacker can specify a path that navigates outside of the intended directory structure.
The attack vector is network-based, as the vulnerability can be exploited remotely without the need for physical access to the server. The complexity of exploitation is low, as it does not require special privileges or user interaction. Once the avatar_url is manipulated, the application may inadvertently delete critical files, leading to an availability impact categorized as high.
Risk & Impact Analysis
The real-world risk for organizations using ClipBucket is significant. The potential for unauthorized deletion of files could affect not only the functionality of the service but also the integrity of the stored data. Given that this vulnerability can be exploited remotely, the blast radius extends to any user that interacts with the platform. Organizations need to assess their exposure and prioritize remediation efforts.
With a CVSS score indicating high severity and a potential impact on availability, organizations must treat this vulnerability with urgency. Immediate patching is necessary to prevent exploitation, and organizations should review their security measures to ensure that similar vulnerabilities do not exist in other parts of their applications.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
ClipBucket versions from 5.3 to prior to 5.5.1 - 237 are affected by this vulnerability. Organizations running these versions should update to the fixed version immediately to mitigate risks.
Mitigation & Remediation
To remediate this vulnerability, users must upgrade to ClipBucket version 5.5.1 - 237 or later. If immediate patching is not feasible, organizations should implement input validation and sanitization for all user inputs related to file handling. Network controls can also help limit exposure to potential attacks. Regular monitoring and security assessments are critical to ensure ongoing protection.
Organizations should validate remediation through penetration testing to identify similar weaknesses.
Detection Guidance
Organizations should monitor logs for unusual file deletion activities and implement alerts for suspicious behavior. Behavioral anomalies, such as unexpected changes in user permissions or file access patterns, should also be tracked. Additionally, monitoring network traffic for exploitation attempts can provide early detection of potential threats.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-21622 highlights the importance of robust input validation in web applications. As organizations increasingly rely on web-based platforms, vulnerabilities such as this underscore the need for continuous security improvements. Security teams should take this as an opportunity to reevaluate their security postures and ensure that similar vulnerabilities are addressed proactively.
This vulnerability represents a common pattern where inadequate validation can lead to severe consequences. Organizations should prioritize education and awareness of secure coding practices to prevent similar vulnerabilities in the future. For comprehensive guidance on strengthening application security, refer to application security best practices.
Vulnerabilities like CVE-2025-21622 serve as reminders for organizations to adopt a proactive security approach. Regular reviews of security measures, including penetration testing and vulnerability assessments, can provide organizations with the insights needed to defend against evolving threats. For effective vulnerability management, consider integrating a vulnerability management program that aligns with your organizational needs.
Continuing education and awareness campaigns can also play a crucial role in preventing such vulnerabilities. By fostering a culture of security awareness, organizations can significantly reduce their risk exposure.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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