CVE-2026-21875 PoC — ClipBucket v5 Vulnerable to Blind SQL Injection through Channel Comments

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-21875.yaml

Associated Vulnerability

Title: ClipBucket v5 Vulnerable to Blind SQL Injection through Channel Comments (CVE-2026-21875)
Description:ClipBucket v5 is an open source video sharing platform. Versions 5.5.2-#187 and below allow an attacker to perform Blind SQL Injection through the add comment section within a channel. When adding a comment within a channel, there is a POST request to the /actions/ajax.php endpoint. The obj_id parameter within the POST request to /actions/ajax.php is then used within the user_exists function of the upload/includes/classes/user.class. php file as the $id parameter. It is then used within the count function of the upload/includes/classes/db.class. php file. The $id parameter is concatenated into the query without validation or sanitization, and a user-supplied input like 1' or 1=1-- - can be used to trigger the injection. This issue does not have a fix at the time of publication.

Description

ClipBucket v5.5.2-#187 and below contain a blind SQL injection caused by unsanitized obj_id parameter in /actions/ajax.php used in user_exists function, letting attackers perform blind SQL injection remotely, exploit requires crafted POST request.

File Snapshot

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