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Public proof of conceptFix available

CVE-2026-21875

A public proof of concept exists; no exploitation attested.

  • Published2026-01-08
  • Fixed in5.5.2-191
  • WeaknessCWE-89

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-01-0800:16CVE publishedNVD

Versions per branch

NVD
Oxygenz clipbucket
BranchAffectedFixed in
5.x≥ 5.3, < 5.5.2-1915.5.2-191

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • MacWarrior clipbucket-v5
    Affected
    • = <= 5.5.2-#187no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-07

Fix

  1. Update Oxygenz clipbucket to 5.5.2-191

Advisories and patches

Detection

read 2026-11-09 09:28 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-01-08
  • CNACVSS 3.19.8known since 2026-10-23
  • CNAweakness (CWE)CWE-89known since 2026-10-23
  • FIRST EPSSEPSS score1.8 %2026-11-08
  • ProjectDiscoverydetectionread 2026-11-09

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-01-08
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-21875?

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.

Is CVE-2026-21875 actively exploited?

A proof-of-concept exploit exists for CVE-2026-21875, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-21875?

CVE-2026-21875 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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