CVE-2025-53838
📋 TL;DR
LinkAce versions before 2.1.9 contain a stored cross-site scripting vulnerability that allows attackers to inject malicious JavaScript into link attributes. When users click on crafted links, the JavaScript executes in their browsers, potentially stealing session cookies or performing actions on their behalf. This affects all LinkAce instances running vulnerable versions.
💻 Affected Systems
- LinkAce
📦 What is this software?
Linkace by Linkace
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator session cookies, take over accounts, deface the application, or redirect users to malicious sites.
Likely Case
Session hijacking, credential theft, or unauthorized actions performed in the context of authenticated users.
If Mitigated
Limited impact with proper input validation and output encoding, though the vulnerability still exists.
🎯 Exploit Status
Exploitation requires creating malicious links that users must click, but no authentication is needed to create links in most configurations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.9
Vendor Advisory: https://github.com/Kovah/LinkAce/security/advisories/GHSA-vwmx-v9qf-q656
Restart Required: No
Instructions:
1. Backup your LinkAce database and files. 2. Update LinkAce to version 2.1.9 or later via git pull or package update. 3. Run database migrations if required. 4. Clear application cache.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side input validation to sanitize link attributes before storage.
🧯 If You Can't Patch
- Implement Content Security Policy (CSP) headers to restrict script execution
- Disable user link creation functionality or restrict to trusted users only
🔍 How to Verify
Check if Vulnerable:
Check LinkAce version in admin panel or via 'php artisan --version' command. If version is below 2.1.9, system is vulnerable.Check Version:
php artisan --versionVerify Fix Applied:
Confirm version is 2.1.9 or higher and test by attempting to inject JavaScript into link attributes - it should be properly escaped.📡 Detection & Monitoring
Log Indicators:
- Unusual link creation patterns
- JavaScript code in link attributes in database logs
Network Indicators:
- Unexpected outbound connections from user browsers after clicking links
SIEM Query:
search 'LinkAce' AND ('link created' OR 'link updated') AND contains('javascript:' OR '<script>')