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

> Attackers can execute arbitrary PHP code by exploiting a race condition in ClipBucket's image upload process before validation occurs.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Feb 2026
- **Updated:** 11 Feb 2026
- **Also known as:** GHSA-xq7c-m5r2-9wqj

## What is CVE-2026-25728?

CVE-2026-25728 is a critical vulnerability in MacWarrior clipbucket-v5, published on 10 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### 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.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-25728?

It affects 1 product.


Products: Oxygenz Clipbucket.

## How do I fix CVE-2026-25728?

No fix has been published for CVE-2026-25728 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-25728 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25728 exists.

## Other vulnerabilities in MacWarrior clipbucket-v5

- [CVE-2026-21875](https://insights.sbomify.com/CVE-2026-21875/): ClipBucket v5 Vulnerable to Blind SQL Injection through Channel Comments (critical 9.8)
- [CVE-2025-67418](https://insights.sbomify.com/CVE-2025-67418/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2025-21624](https://insights.sbomify.com/CVE-2025-21624/): ClipBucket V5 Playlist Cover File Upload to Remote Code Execution (critical 9.8)
- [CVE-2024-54135](https://insights.sbomify.com/CVE-2024-54135/): Untrusted Deserialization in ClipBucket-v5 Version 2.0 to 5.5.1 Revision 199 (critical 9.8)
- [CVE-2024-54136](https://insights.sbomify.com/CVE-2024-54136/): Untrusted Deserialization in ClipBucket-v5 Version 5.5.1 Revision 199 and Below (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-25728 and fix it if it is affected.

What it is: CVE-2026-25728 is a critical vulnerability in MacWarrior clipbucket-v5, published on 10 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-25728 exists.

Affected product: MacWarrior clipbucket-v5. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-25728/ (Markdown: https://insights.sbomify.com/CVE-2026-25728/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-25728
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-25728
- OSV: https://osv.dev/vulnerability/CVE-2026-25728

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-25728/
Summaries are generated and may contain mistakes; the official description above is the record.