CVE-2026-77929
ClipBucket < 5.5.3-#182 Remote Code Execution via Photo Upload Endpoint
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 18, 2026
- Updated
- Oct 1, 2026
- Reserved
- Aug 21, 2026
Description
ClipBucket v5 before 5.5.3-#182 contains a file upload vulnerability that allows authenticated users to achieve remote code execution by uploading a PHP file with valid image magic bytes through the photo upload endpoint. The FileUpload::manageFile() function in fileupload.class.php fails to update the file extension after MIME validation, allowing an attacker-controlled .php extension to persist on disk and execute as PHP via PHP-FPM when the uploaded file is retrieved.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-434 Unrestricted Upload of File with Dangerous Type
Affected Products
| Product | Versions |
|---|---|
clipbucket-v5MacWarrior |
|
References
- ClipBucket 5.5.3-#182 Release Notesrelease-notes
- Patch Commitpatch
- https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo-upload-endpointthird-party-advisory
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