Vulnerability · Published Feb 10, 2026 · Assigned by GitHub_M
CVE-2026-25728ClipBucket v5 Affected by Remote Code Execution via Avatar/Background File Upload Race Condition
Critical 9.3
In plain English
A critical-severity security flaw in clipbucket-v5 from MacWarrior. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MacWarrior | clipbucket-v5 | < 5.5.3 - #40 |
Weakness: CWE-367 · Vector: 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