---
id: CVE-2026-77929
title: >-
  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
summary: >-
  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:…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
vendor: MacWarrior
product: clipbucket-v5
affected:
  - clipbucket-v5 < 5.5.3-#182
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T16:17:09.460'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77929'
references:
  - url: >-
      https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b44c17c56978cd
    label: disclosure@vulncheck.com
  - url: 'https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo-upload-endpoint
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T15:26:44.912744Z'
ingestedAt: '2026-09-18T14:43:13.065Z'
epss: 0.0051
epssPercentile: 0.42362
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.