CVE-2026-23944
📋 TL;DR
CVE-2026-23944 is an authentication bypass vulnerability in Arcane Docker management interface that allows unauthenticated attackers to proxy requests to remote environment agents. This enables unauthorized access to Docker operations like listing containers, streaming logs, and manipulating resources. All Arcane installations prior to version 1.13.2 with remote environments configured are affected.
💻 Affected Systems
- Arcane Docker Management Interface
📦 What is this software?
Arcane by Arcane
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all Docker containers managed by Arcane, including data theft, service disruption, and lateral movement to other systems via container breakout.
Likely Case
Unauthorized access to container logs, configuration data, and ability to stop/start containers, potentially leading to data exposure and service disruption.
If Mitigated
Limited impact if network segmentation prevents external access, but internal attackers could still exploit the vulnerability.
🎯 Exploit Status
The vulnerability is straightforward to exploit by crafting requests to the environment proxy endpoint without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.13.2
Vendor Advisory: https://github.com/getarcaneapp/arcane/security/advisories/GHSA-2jv8-39rp-cqqr
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Stop Arcane service. 3. Update to version 1.13.2 using package manager or manual installation. 4. Restart Arcane service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Arcane API endpoints using firewall rules
iptables -A INPUT -p tcp --dport [ARCANE_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [ARCANE_PORT] -j DROP
Disable Remote Environments
allTemporarily disable or remove remote environment configurations
Edit Arcane configuration to remove remote environment settings
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Arcane from untrusted networks
- Deploy a reverse proxy with authentication in front of Arcane to validate all requests
🔍 How to Verify
Check if Vulnerable:
Check Arcane version: if version < 1.13.2 and remote environments are configured, system is vulnerableCheck Version:
arcane --version or check package managerVerify Fix Applied:
Verify version is 1.13.2 or higher and test that unauthenticated requests to /api/environments/{id}/ endpoints are rejected📡 Detection & Monitoring
Log Indicators:
- Unauthenticated requests to /api/environments/ endpoints
- Failed authentication attempts followed by successful proxy requests
Network Indicators:
- HTTP requests to /api/environments/{id}/ without authentication headers
- Unusual traffic patterns to remote environment agents
SIEM Query:
source="arcane" AND (uri_path="/api/environments/*" AND NOT auth_token=*)