CVE-2026-23520
📋 TL;DR
CVE-2026-23520 is a command injection vulnerability in Arcane's docker management platform that allows authenticated users to execute arbitrary shell commands on the host system. The vulnerability occurs when lifecycle labels containing malicious commands are processed during container updates. Any organization running Arcane versions before 1.13.0 with authenticated user access is affected.
💻 Affected Systems
- Arcane Docker Management Platform
📦 What is this software?
Arcane by Arcane
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary commands with container privileges, potentially leading to data exfiltration, ransomware deployment, or complete system takeover.
Likely Case
Privilege escalation from authenticated user to container execution context, enabling lateral movement, data access, and persistence mechanisms within the container environment.
If Mitigated
Limited impact if proper network segmentation, least privilege access, and container security controls are implemented, potentially containing the exploit to isolated environments.
🎯 Exploit Status
Exploitation requires authenticated user access to create projects with malicious lifecycle labels, then waiting for administrator-triggered updates.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.13.0
Vendor Advisory: https://github.com/getarcaneapp/arcane/security/advisories/GHSA-gjqq-6r35-w3r8
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Stop Arcane services. 3. Update to version 1.13.0 using official package or container image. 4. Restart Arcane services. 5. Verify functionality.
🔧 Temporary Workarounds
Restrict Project Creation
allLimit project creation to administrators only through access controls.
# Configure RBAC to restrict project creation to admin users only
Disable Scheduled Updates
allTemporarily disable automatic container updates to prevent trigger conditions.
# Set update checks to manual only in Arcane configuration
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Arcane instances from critical systems
- Enforce least privilege access controls and audit all authenticated user activities
🔍 How to Verify
Check if Vulnerable:
Check Arcane version: if version < 1.13.0, system is vulnerable. Review project configurations for suspicious lifecycle labels.Check Version:
docker inspect arcane | grep -i version OR check Arcane web interface version displayVerify Fix Applied:
Confirm Arcane version is 1.13.0 or later. Test that lifecycle labels are properly sanitized during container updates.📡 Detection & Monitoring
Log Indicators:
- Unusual shell command execution in container logs
- Suspicious lifecycle label modifications in audit logs
- Unexpected process creation during container updates
Network Indicators:
- Outbound connections from containers to unexpected destinations during update cycles
- Command and control traffic patterns
SIEM Query:
source="arcane" AND (event="container_update" OR event="lifecycle_execution") AND command="*;*" OR command="*|*" OR command="*&*"