CVE-2026-3118
📋 TL;DR
An authenticated user can inject malicious input into GraphQL queries in Red Hat Developer Hub's Orchestrator Plugin, causing the entire Backstage application to crash and restart. This creates a denial of service that temporarily blocks all legitimate users from accessing the platform. Only authenticated users can exploit this vulnerability.
💻 Affected Systems
- Red Hat Developer Hub (Backstage)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Malicious actor repeatedly crashes the Backstage application, causing sustained platform unavailability and disrupting developer workflows and deployments.
Likely Case
Accidental or targeted DoS attacks causing intermittent platform outages and service disruption.
If Mitigated
Minimal impact with proper input validation and monitoring in place to detect and block malicious queries.
🎯 Exploit Status
Exploitation requires authenticated access but the injection technique is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Red Hat advisory for specific fixed versions
Vendor Advisory: https://access.redhat.com/security/cve/CVE-2026-3118
Restart Required: Yes
Instructions:
1. Check Red Hat advisory for affected versions. 2. Update to patched version. 3. Restart Backstage application. 4. Verify fix by testing GraphQL query handling.
🔧 Temporary Workarounds
Disable Orchestrator Plugin
allTemporarily disable the vulnerable Orchestrator Plugin to prevent exploitation
Modify Backstage configuration to disable orchestrator plugin
Implement GraphQL Query Validation
allAdd input validation and query complexity limits to GraphQL endpoints
Configure GraphQL server with query depth/ complexity limits
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for unusual GraphQL query patterns
- Deploy WAF rules to detect and block malicious GraphQL payloads
🔍 How to Verify
Check if Vulnerable:
Check Backstage version against Red Hat advisory. Test GraphQL endpoint with crafted queries to see if application crashes.Check Version:
Check Backstage version in application configuration or via admin interfaceVerify Fix Applied:
After patching, attempt to reproduce the crash with malicious GraphQL queries - application should handle input gracefully.📡 Detection & Monitoring
Log Indicators:
- Application crash/restart logs
- Unusually large or complex GraphQL queries
- Repeated authentication failures followed by GraphQL requests
Network Indicators:
- Spike in GraphQL request errors
- Application unavailability patterns
SIEM Query:
source="backstage" AND ("crash" OR "restart") AND "graphql"