CVE-2026-77929: Unrestricted Upload of File with Dangerous Type in MacWarrior clipbucket-v5
ClipBucket v5 before 5.5.3-#182 has a file upload vulnerability that allows authenticated users to upload PHP files disguised as images. This occurs because the file upload function does not properly update the file extension after MIME type validation, enabling remote code execution via PHP-FPM when the file is accessed.
AI Analysis
Technical Summary
CVE-2026-77929 affects ClipBucket v5 versions prior to 5.5.3-#182. The vulnerability arises in the FileUpload::manageFile() function within fileupload.class.php, where the file extension is not updated after MIME validation. This allows an attacker with authentication to upload a PHP file with valid image magic bytes through the photo upload endpoint. The malicious file retains its .php extension on disk and can be executed remotely via PHP-FPM, leading to remote code execution.
Potential Impact
An authenticated attacker can achieve remote code execution on the affected system by uploading a crafted PHP file that bypasses MIME validation checks. This can lead to full compromise of the server hosting ClipBucket, allowing execution of arbitrary code with the privileges of the web server process.
Mitigation Recommendations
A fix is available in ClipBucket v5.5.3-#182 and later. Users should upgrade to this version or newer to remediate the vulnerability. No other mitigation guidance is provided in the available data.
CVE-2026-77929: Unrestricted Upload of File with Dangerous Type in MacWarrior clipbucket-v5
Description
ClipBucket v5 before 5.5.3-#182 has a file upload vulnerability that allows authenticated users to upload PHP files disguised as images. This occurs because the file upload function does not properly update the file extension after MIME type validation, enabling remote code execution via PHP-FPM when the file is accessed.
CVSS v4.0
Score 8.7high
Affected software
MacWarrior
clipbucket-v5
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-77929 affects ClipBucket v5 versions prior to 5.5.3-#182. The vulnerability arises in the FileUpload::manageFile() function within fileupload.class.php, where the file extension is not updated after MIME validation. This allows an attacker with authentication to upload a PHP file with valid image magic bytes through the photo upload endpoint. The malicious file retains its .php extension on disk and can be executed remotely via PHP-FPM, leading to remote code execution.
Potential Impact
An authenticated attacker can achieve remote code execution on the affected system by uploading a crafted PHP file that bypasses MIME validation checks. This can lead to full compromise of the server hosting ClipBucket, allowing execution of arbitrary code with the privileges of the web server process.
Mitigation Recommendations
A fix is available in ClipBucket v5.5.3-#182 and later. Users should upgrade to this version or newer to remediate the vulnerability. No other mitigation guidance is provided in the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-21T17:52:36.079Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aadb77055bf5e2cf59e6405
Added to database: 09/18/2026, 22:13:04 UTC
Last enriched: 09/18/2026, 22:15:07 UTC
Last updated: 09/19/2026, 01:43:04 UTC
Views: 6
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