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CVE-2026-25728— ClipBucket v5 Affected by Remote Code Execution via Avatar/Background File Upload Race Condition

Quick assessment

Affected
MacWarrior clipbucket-v5
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ClipBucket是MacWarrior开源的一个开源且可免费下载的 PHP 脚本。用于共享视频网站。 ClipBucket 5.5.3 - #40之前版本存在安全漏洞，该漏洞源于头像和背景图片上传功能存在竞争条件，可能导致执行任意PHP代码。

AI Predicted 9.8 Difficulty: Easy EPSS 0.41% · P33
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I. Basic Information for CVE-2026-25728

Vulnerability Information
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Vulnerability Title
ClipBucket v5 Affected by Remote Code Execution via Avatar/Background File Upload Race Condition
Source: CVE Program / CVE List V5
Vulnerability Description
ClipBucket v5 is an open source video sharing platform. Prior to 5.5.3 - #40, a Time-of-Check to Time-of-Use (TOCTOU) race condition vulnerability exists in ClipBucket's avatar and background image upload functionality. The application moves uploaded files to a web-accessible location before validating them, creating a window where an attacker can execute arbitrary PHP code before the file is deleted. The uploaded file was moved to a web-accessible path via move_uploaded_file(), then validated via ValidateImage(). If validation failed, the file was deleted via @unlink(). This vulnerability is fixed in 5.5.3 - #40.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
ClipBucket 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ClipBucket是MacWarrior开源的一个开源且可免费下载的 PHP 脚本。用于共享视频网站。 ClipBucket 5.5.3 - #40之前版本存在安全漏洞，该漏洞源于头像和背景图片上传功能存在竞争条件，可能导致执行任意PHP代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
MacWarrior clipbucket-v5 < 5.5.3 - #40 -

II. Public POCs for CVE-2026-25728

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III. Intelligence Information for CVE-2026-25728

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Patches & Fixes for CVE-2026-25728 (1)

IV. Related Vulnerabilities

Same product: clipbucket-v5
Same vendor: MacWarrior
Same weakness: CWE-367

V. Comments for CVE-2026-25728

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