CVE-2026-77929

8.8 HIGHpublic exploit available

Published 2026-09-18 · Updated 2026-09-22

AI risk analysis

Summary: This vulnerability allows authenticated users to upload a PHP file that can be executed remotely, leading to potential full system compromise.
Exploitability: Exploitation is relatively straightforward for an attacker who can authenticate, as the flaw lies in the file extension validation process.
Blast radius: If exploited, the impact could be severe, as it allows for remote code execution on the server hosting the ClipBucket application.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to ClipBucket v5.5.3-#182 or later.

rceauth-requiredweb

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-434

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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