Executive Summary

CVE-2026-32321 is an authenticated time-based blind SQL injection vulnerability in the ClipBucket video sharing platform versions prior to 5.5.3. It exists in the `actions/ajax.php` endpoint due to insufficient input sanitization of the `userid` parameter. An attacker who is authenticated can exploit this by injecting arbitrary SQL queries through the `userid` parameter, which is directly used in SQL statements without proper cleaning or validation.

This vulnerability allows attackers to execute unauthorized SQL commands, potentially leading to full disclosure of the database contents and administrative account takeover.

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Impact Analysis

This vulnerability can have severe impacts including unauthorized access to sensitive data stored in the database, such as user credentials and administrative account information.

• Full database disclosure allowing attackers to extract sensitive information.
• Potential administrative account takeover, enabling attackers to gain control over the application.
• Further compromise of the application and possibly the underlying server.

The vulnerability has a high severity rating with a CVSS v3.1 score of 8.8, indicating high impact on confidentiality, integrity, and availability.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by performing authenticated SQL injection testing on the ClipBucket endpoint `/actions/ajax.php` targeting the `userid` POST parameter.'}, {'type': 'paragraph', 'content': 'Automated tools like sqlmap can be used to detect the time-based blind SQL injection by sending crafted POST requests with malicious `userid` values.'}, {'type': 'paragraph', 'content': 'An example sqlmap command to test for this vulnerability is:'}, {'type': 'list_item', 'content': 'sqlmap -u "http://[TARGET_URL]/actions/ajax.php" --data "mode=get_subscribers_count&userid=1" --cookie "PHPSESSID=[SESSION_COOKIE]" -p userid --dbms mysql --technique T --batch'}] [2]

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Mitigation Strategies

The immediate mitigation step is to upgrade ClipBucket to version 5.5.3 or later, where this vulnerability has been fixed.

The fix involves proper input sanitization and type casting of the `userid` parameter before it is used in SQL queries, preventing SQL injection.

If upgrading immediately is not possible, ensure that all user inputs, especially the `userid` parameter in `/actions/ajax.php`, are sanitized by casting to integers or using sanitization functions like `mysql_clean()` before use in SQL queries.

Additionally, restrict access to authenticated users only and monitor for suspicious database query patterns or unusual activity related to the `userid` parameter.

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