# CVE-2026-77929: ClipBucket < 5.5.3-#182 Remote Code Execution via Photo Upload Endpoint

> Authenticated attackers can achieve remote code execution by uploading a PHP file with valid image magic bytes to the photo upload endpoint.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Sep 2026
- **Updated:** 1 Oct 2026
- **Also known as:** GHSA-g885-94pf-hc9v

## What is CVE-2026-77929?

CVE-2026-77929 is a high-severity vulnerability in MacWarrior clipbucket-v5, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-77929?


## How do I fix CVE-2026-77929?

No fix has been published for CVE-2026-77929 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77929 being exploited?

There is no known exploitation of CVE-2026-77929 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77929 and fix it if it is affected.

What it is: CVE-2026-77929 is a high-severity vulnerability in MacWarrior clipbucket-v5, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-77929 in the wild and no public exploit code.

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-2026-77929/ (Markdown: https://insights.sbomify.com/CVE-2026-77929/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77929
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77929
- OSV: https://osv.dev/vulnerability/CVE-2026-77929

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-77929/
Summaries are generated and may contain mistakes; the official description above is the record.