Vulnerability · Published Sep 18, 2026 · Assigned by VulnCheck

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

High 8.8

In plain English

A high-severity unrestricted file upload in clipbucket-v5 from MacWarrior. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.9%top 38.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
MacWarrior	clipbucket-v5	0 – before 5.5.3-#182

Weakness: CWE-434 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

ClipBucket 5.5.3-#182 Release Notes release-notes
Patch Commit patch
https://www.vulncheck.com/advisories/clipbucket-remote-code-execution-via-photo-upload-endpoint third-party-advisory