ClipBucket v5, an open-source video sharing platform developed by OxygenZ, contains a critical vulnerability identified as CVE-2026-21875. This vulnerability allows an attacker to perform Blind SQL Injection through the add comment section within a channel. When a comment is added, a POST request is sent to the /actions/ajax.php endpoint, where the obj_id parameter is concatenated into a database query without proper validation or sanitization.
The vulnerability has been assigned a CVSS score of 9.8, marking it as critical. This high severity level indicates that exploitation could lead to severe impacts, including unauthorized access to sensitive data and potential disruption of service. Currently, there is no fix available for this issue, underscoring the urgency for organizations using affected versions to take immediate action.
Risk to organizations includes exposure of sensitive information and a significant impact on data integrity and availability. The absence of a patch at the time of publication means that users must be vigilant and consider alternative mitigation strategies until a fix is released.
Organizations should prioritize evaluating their use of ClipBucket v5 and implement necessary defensive measures to protect against potential exploitation. Given the critical nature of this vulnerability, proactive monitoring and security assessments are advised.
Vulnerability Details
The official CVE description outlines that ClipBucket versions 5.5.2-#187 and below are vulnerable. The vulnerability is categorized under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), leading to Blind SQL Injection through the comment functionality.
The attack vector is classified as NETWORK with low complexity, requiring no privileges or user interaction for exploitation. The potential impacts from this vulnerability include high confidentiality, integrity, and availability impacts.
The CVSS score of 9.8 indicates a critical severity, making this a high-priority issue for affected organizations. The vulnerability was published on January 8, 2026, and remains unpatched as of the last update.
Technical Analysis
The root cause of the vulnerability stems from the lack of input validation and sanitization regarding user-supplied data in the SQL query. The obj_id parameter from the POST request to /actions/ajax.php is directly utilized in a database operation, making it susceptible to SQL injection attacks.
The attack vector is exposed over the network, allowing attackers to exploit the vulnerability remotely. The complexity is low, as no special conditions need to be met for successful exploitation. Additionally, the attacker does not need any privileges, nor is any user interaction required.
If exploited, attackers could gain unauthorized access to sensitive data stored in the database, leading to significant confidentiality, integrity, and availability impacts. Organizations using vulnerable versions of ClipBucket must be aware of this risk and take steps to mitigate potential exploitation.
Risk & Impact Analysis
The risk to organizations includes potential data breaches and unauthorized access to critical information. Given the nature of the vulnerability, the blast radius could extend to all users interacting with the affected functionalities, significantly impacting the organization’s reputation and financial standing.
The urgency for remediation is critical, as the CVSS score of 9.8 highlights the severity of the threat. Organizations are advised to monitor for unusual activities within their ClipBucket installations and prepare to implement patches as soon as they are made available.
Given the potential for exploitation and the current absence of a patch, organizations must act to safeguard their data and assess the impact of this vulnerability on their operational practices.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions of ClipBucket include 5.5.2-#187 and below. Organizations running these versions should take immediate steps to assess their risk and prepare for possible exploitation.
Mitigation & Remediation
As there is no patch available at this time, organizations should consider other mitigation strategies. It is recommended to restrict access to the affected functionalities and implement input validation measures to prevent SQL injection. Additionally, monitoring for unusual activity in the application can help detect potential exploitation attempts.
Organizations should also prepare for future updates from the vendor and validate the effectiveness of their security measures through continuous penetration testing to identify any remaining weaknesses.
Detection Guidance
Organizations should monitor logs for any unusual POST requests to the /actions/ajax.php endpoint. Behavioral anomalies such as unexpected comment submissions or database errors may indicate attempts to exploit the vulnerability. Network signatures associated with SQL injection attacks should also be reviewed.
AppSecure Threat Intelligence Insight
The significance of CVE-2026-21875 lies in the critical nature of the vulnerability and the potential it has for widespread exploitation in real-world scenarios. This incident highlights the importance of secure coding practices and the necessity for timely updates to software.
Organizations can learn from this vulnerability by enhancing their security practices and ensuring that they regularly assess their applications for vulnerabilities. As a part of a robust security strategy, teams should prioritize vulnerability management programs that can identify and remediate weaknesses before they can be exploited.
Furthermore, maintaining awareness of new threats and vulnerabilities in the software landscape will equip security teams with the knowledge needed to defend against emerging risks. Investing in ongoing training and security awareness campaigns can also greatly reduce the likelihood of successful attacks.
For further insights on effective security measures, organizations are encouraged to explore strategies for penetration testing methodologies and the importance of developing a comprehensive API security strategy to bolster defenses against vulnerabilities like CVE-2026-21875.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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