PHP
CVE-2026-21875
CRITICAL
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
AnalysisAI
ClipBucket v5 (5.5.2-#187 and below) has blind SQL injection in the channel comment functionality via the obj_id parameter. Unauthenticated attackers can extract the entire database. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | ClipBucket v5.5.2-#187 and below with comment functionality enabled on channels. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.8 (Critical). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker uses sqlmap with the blind injection technique against the obj_id parameter, extracting user credentials, email addresses, and any stored payment information from the ClipBucket database. |
| Remediation | Update ClipBucket. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 24 hours: Identify all affected systems and apply vendor patches immediately. …
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