CVE-2026-77929 Details
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.
A remote code execution vulnerability exists in ClipBucket versions 5.5.3-#182 and prior. The issue arises in the photo upload endpoint, where authenticated users can upload PHP files disguised as images. The vulnerability is due to the FileUpload::manageFile() function in fileupload.class.php, which fails to properly handle file extensions after validating MIME types. This oversight allows an attacker to upload a PHP file that is executed via PHP-FPM when accessed, leading to remote code execution.
Users are advised to update to ClipBucket version 5.5.3-#182 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 18, 2026CISA-ADP
Assessed Sep 18, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-434 | Unrestricted Upload of File with Dangerous Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| ClipBucket | < 5.5.3-#182 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 18, 2026 | CVE Modified | CISA-ADP |
| Sep 18, 2026 | New CVE Received | [email protected] |