CVE-2025-8279
📋 TL;DR
This vulnerability allows attackers to execute arbitrary GraphQL queries on GitLab Language Server due to insufficient input validation. This could lead to unauthorized data access or manipulation. Affects GitLab Language Server versions 7.6.0 through 7.29.x.
💻 Affected Systems
- GitLab Language Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of GitLab instance with unauthorized access to source code, user data, and potential lateral movement within the environment.
Likely Case
Unauthorized data extraction including source code, user information, and project metadata through GraphQL queries.
If Mitigated
Limited impact with proper network segmentation and access controls preventing external exploitation.
🎯 Exploit Status
GraphQL injection vulnerability that doesn't require authentication to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.30.0 and later
Vendor Advisory: https://gitlab.com/gitlab-org/gitlab/-/issues/538205
Restart Required: Yes
Instructions:
1. Update GitLab Language Server to version 7.30.0 or later. 2. Restart the Language Server service. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable Language Server
linuxTemporarily disable the GitLab Language Server component
gitlab-ctl stop gitlab-language-server
systemctl disable gitlab-language-server
Network Isolation
linuxRestrict network access to Language Server port
iptables -A INPUT -p tcp --dport <language-server-port> -j DROP
🧯 If You Can't Patch
- Implement strict network access controls to isolate Language Server from untrusted networks.
- Monitor for unusual GraphQL query patterns and implement rate limiting.
🔍 How to Verify
Check if Vulnerable:
Check GitLab Language Server version: gitlab-language-server --versionCheck Version:
gitlab-language-server --versionVerify Fix Applied:
Confirm version is 7.30.0 or higher and test GraphQL query validation📡 Detection & Monitoring
Log Indicators:
- Unusual GraphQL query patterns in Language Server logs
- Multiple failed query attempts
- Queries accessing unauthorized data
Network Indicators:
- Unusual traffic to Language Server port
- GraphQL queries from unexpected sources
SIEM Query:
source="gitlab-language-server" AND ("GraphQL" OR "query") AND status="200"