# CVE-2026-77929: ClipBucket file upload remote code execution

Source: https://junglewise.ai/threats/cve-2026-77929-clipbucket-file-upload-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-18. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77929 · Severity: high · CVSS 8.8 · Published 2026-09-18

ClipBucket is a popular video sharing and content management platform. The application contains a vulnerability in its photo upload feature that allows authenticated users to upload malicious PHP files disguised as images, leading to remote code execution on the server. An attacker with a valid account can take complete control of the web server and access sensitive data stored within the application.

## Quick answers

**Is CVE-2026-77929 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77929 being exploited in the wild.

**How severe is CVE-2026-77929?** High severity, with a CVSS score of 8.8, published 18 September 2026.

**Which products and versions are affected?** ClipBucket ClipBucket before 5.5.3-#182.

**Is there a fix for CVE-2026-77929?** A patch was published on 2026-08-28: Fix released in version 5.5.3-#182 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-77929 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77929?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the FileUpload::manageFile() function in fileupload.class.php, where MIME type validation is performed on uploaded files but the file extension is not properly updated after validation. An attacker can upload a PHP file with forged image magic bytes (MIME header) that passes MIME validation; the .php extension persists on disk and the file executes as PHP via PHP-FPM when accessed. This is a post-authentication remote code execution vulnerability requiring a valid user account. The vulnerability is fixed in version 5.5.3-#182 and later.

## Affected products

- ClipBucket ClipBucket before 5.5.3-#182

## Timeline

- 2026-09-18: disclosed
- 2026-08-28: patched: Fix released in version 5.5.3-#182

## References

- [https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b44c17c56978cd](https://github.com/MacWarrior/clipbucket-v5/commit/61cce55ab26ef88fb782dfde47b44c17c56978cd)
- [https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182](https://github.com/MacWarrior/clipbucket-v5/releases/tag/5.5.3-%23182)