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.

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History

Fri, 18 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title ClipBucket < 5.5.3-#182 Remote Code Execution via Photo Upload Endpoint
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.7, 'vector': '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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-18T15:27:53.729Z

Reserved: 2026-08-21T17:52:36.079Z

Link: CVE-2026-77929

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-18T15:17:13.287

Modified: 2026-09-18T15:17:13.287

Link: CVE-2026-77929

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses