CVE-2025-21623
📋 TL;DR
This vulnerability in ClipBucket V5 allows unauthenticated attackers to perform directory traversal attacks to change the template directory, leading to denial of service. All ClipBucket V5 installations prior to version 5.5.1-238 are affected. The attack requires no authentication and can be executed remotely.
💻 Affected Systems
- ClipBucket V5
📦 What is this software?
Clipbucket by Oxygenz
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption making the video hosting platform unavailable to all users, potentially requiring manual intervention to restore functionality.
Likely Case
Temporary denial of service affecting website availability, requiring administrator intervention to restore proper template configuration.
If Mitigated
Minimal impact with proper input validation and access controls preventing directory traversal attempts.
🎯 Exploit Status
The vulnerability requires no authentication and directory traversal attacks are relatively simple to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.5.1-238 or later
Vendor Advisory: https://github.com/MacWarrior/clipbucket-v5/security/advisories/GHSA-ffhj-hprx-7qvr
Restart Required: No
Instructions:
1. Backup your current installation. 2. Download the latest version from the official repository. 3. Replace vulnerable files with patched versions. 4. Verify the fix by checking the version number.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to block directory traversal sequences in template-related parameters
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block directory traversal patterns
- Restrict network access to the ClipBucket application to trusted sources only
🔍 How to Verify
Check if Vulnerable:
Check if your ClipBucket version is earlier than 5.5.1-238 by examining the version file or admin panelCheck Version:
Check the version.php file or admin panel system informationVerify Fix Applied:
Verify the version is 5.5.1-238 or later and test template directory functionality📡 Detection & Monitoring
Log Indicators:
- Unusual template directory change requests
- Directory traversal patterns in HTTP requests
- Multiple failed template loading attempts
Network Indicators:
- HTTP requests containing '../' sequences in template parameters
- Unusual spikes in error responses from the application
SIEM Query:
source="web_server" AND (uri="*../*" OR params="*../*") AND dest="clipbucket_host"