CVE-2026-25958
📋 TL;DR
Cube semantic layer versions 0.27.19 through 1.5.12, 1.4.1 and earlier, and 1.0.13 and earlier contain an API token validation vulnerability that allows authenticated users to escalate privileges. Attackers with valid API tokens can craft requests to gain unauthorized access to data or administrative functions. Organizations using affected Cube deployments are at risk.
💻 Affected Systems
- Cube semantic layer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative control over the Cube instance, potentially accessing all data sources, modifying configurations, and compromising downstream data applications.
Likely Case
Unauthorized data access or modification through elevated privileges, leading to data integrity issues or information disclosure.
If Mitigated
Limited impact with proper network segmentation, API token rotation, and monitoring in place.
🎯 Exploit Status
Exploitation requires a valid API token and knowledge of the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.5.13, 1.4.2, or 1.0.14
Vendor Advisory: https://github.com/cube-js/cube/security/advisories/GHSA-v226-32c7-x2v7
Restart Required: Yes
Instructions:
1. Identify your Cube version. 2. Upgrade to 1.5.13, 1.4.2, or 1.0.14 based on your major version. 3. Restart the Cube service. 4. Verify the upgrade was successful.
🔧 Temporary Workarounds
API Token Rotation
allRotate all API tokens to invalidate potentially compromised credentials.
cube_token rotate --all-tokens
Network Access Restriction
linuxRestrict access to Cube API endpoints to trusted IP ranges only.
iptables -A INPUT -p tcp --dport 4000 -s TRUSTED_IP_RANGE -j ACCEPT
iptables -A INPUT -p tcp --dport 4000 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Cube instances from untrusted networks.
- Enforce least privilege access controls and monitor all API token usage for anomalies.
🔍 How to Verify
Check if Vulnerable:
Check Cube version using the admin API or configuration files. If version is between 0.27.19 and 1.5.12, 1.4.1 or earlier, or 1.0.13 or earlier, the system is vulnerable.Check Version:
curl http://localhost:4000/cubejs-api/v1/meta | grep versionVerify Fix Applied:
Confirm version is 1.5.13, 1.4.2, or 1.0.14 and test API token validation with privilege escalation attempts.📡 Detection & Monitoring
Log Indicators:
- Unusual API token usage patterns
- Requests attempting privilege escalation
- Access to administrative endpoints from non-admin tokens
Network Indicators:
- Multiple failed privilege escalation attempts
- Unusual API request patterns to sensitive endpoints
SIEM Query:
source="cube_logs" AND (event="privilege_escalation_attempt" OR token_usage="anomalous")