CVE-2026-21875
CriticalPublic exploitClipBucket v5 Vulnerable to Blind SQL Injection through Channel Comments
Published Jan 7, 2026 · Updated Aug 12, 2026 · Also known as GHSA-crpv-fmc4-j392
Key Facts
Patch immediately- CVE-2026-21875 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Clipbucket (Oxygenz), clipbucket-v5.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 1.7% probability of exploitation in the next 30 days.
- Fixed versions are available, including Clipbucket 5.5.2-191.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.7%
Higher than 77.2% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-21875 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| ClipbucketOxygenz | See advisory | 5.5.2-191 |
| clipbucket-v5 | >= <= 5.5.2-#187 | n/a |
Patched Releases
Clipbucket
5.5.2-191
Timeline
Publicly disclosed
Jan 7, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
References
FAQ
Common Questions.
ClipBucket v5 is an open source video sharing platform.
Affected: Clipbucket (Oxygenz); clipbucket-v5 versions >= <= 5.5.2-#187. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Clipbucket 5.5.2-191.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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