CVE-2026-26279
📋 TL;DR
A typo in Froxlor's input validation code (== instead of =) disables email format checking for admin email settings. This allows authenticated admins to inject arbitrary strings into a root-level cron job shell command, leading to full remote code execution. All Froxlor installations prior to version 2.3.4 with admin users are affected.
💻 Affected Systems
- Froxlor
📦 What is this software?
Froxlor by Froxlor
⚠️ Risk & Real-World Impact
Worst Case
Full root-level remote code execution on the server, allowing complete system compromise, data theft, and lateral movement.
Likely Case
Authenticated admin users can execute arbitrary commands as root, potentially leading to server takeover.
If Mitigated
With proper access controls limiting admin privileges, impact is reduced but still significant if any admin account is compromised.
🎯 Exploit Status
Exploitation requires authenticated admin access. The vulnerability is straightforward to exploit once admin credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.4
Vendor Advisory: https://github.com/froxlor/Froxlor/security/advisories/GHSA-33mp-8p67-xj7c
Restart Required: No
Instructions:
1. Backup your Froxlor configuration and database. 2. Download Froxlor 2.3.4 from the official releases. 3. Replace existing files with the new version. 4. Run the update script if prompted.
🔧 Temporary Workarounds
Restrict Admin Access
linuxLimit admin panel access to trusted IP addresses only.
# Configure web server (Apache/nginx) to restrict access to Froxlor admin panel
# Example for Apache: Require ip 192.168.1.0/24
# Example for nginx: allow 192.168.1.0/24; deny all;
Monitor Admin Email Changes
linuxImplement monitoring for changes to admin email settings.
# Monitor Froxlor configuration files for changes
# Example: inotifywait -m /var/www/froxlor/ -e modify | grep --line-buffered 'config'
🧯 If You Can't Patch
- Implement strict access controls and multi-factor authentication for all admin accounts.
- Monitor and audit all admin activities, particularly changes to email settings and cron job executions.
🔍 How to Verify
Check if Vulnerable:
Check Froxlor version. If version is below 2.3.4, the system is vulnerable.Check Version:
grep 'version' /var/www/froxlor/lib/version.php | head -1Verify Fix Applied:
Verify Froxlor version is 2.3.4 or higher after update.📡 Detection & Monitoring
Log Indicators:
- Unusual cron job executions as root
- Changes to admin email settings in Froxlor logs
- Shell command execution patterns in system logs
Network Indicators:
- Unusual outbound connections from Froxlor server
- Suspicious payloads in HTTP requests to Froxlor admin panel
SIEM Query:
source="froxlor.log" AND ("adminmail" OR "cron" OR "root")