CVE-2026-25530
📋 TL;DR
This vulnerability allows authenticated Kanboard users to access swimlane data from projects they shouldn't have permission to view. It affects all Kanboard instances running versions before 1.2.50. The issue stems from missing authorization checks in the getSwimlane API method.
💻 Affected Systems
- Kanboard
📦 What is this software?
Kanboard by Kanboard
⚠️ Risk & Real-World Impact
Worst Case
Authenticated users could access sensitive project swimlane data across the entire Kanboard instance, potentially exposing confidential project information, task assignments, and workflow details.
Likely Case
Users with legitimate access to some projects could inadvertently or intentionally view swimlane data from other projects they shouldn't access, violating project isolation and confidentiality requirements.
If Mitigated
With proper access controls and monitoring, the impact is limited to information disclosure within authenticated user sessions, but still violates least privilege principles.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated. The vulnerability is in the API authorization logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.50
Vendor Advisory: https://github.com/kanboard/kanboard/security/advisories/GHSA-6rxw-vvvj-r93q
Restart Required: Yes
Instructions:
1. Backup your Kanboard installation and database
2. Download Kanboard 1.2.50 or later from https://github.com/kanboard/kanboard/releases
3. Replace the existing installation with the new version
4. Restart your web server
5. Verify the update was successful
🔧 Temporary Workarounds
API Endpoint Restriction
allRestrict access to the vulnerable API endpoint using web server rules or application firewall
# Example for Apache: RewriteRule ^/jsonrpc.php.*getSwimlane - [F]
# Example for Nginx: location ~* /jsonrpc.php.*getSwimlane { return 403; }
🧯 If You Can't Patch
- Implement strict network segmentation to limit which users can access the Kanboard API endpoints
- Enable detailed API access logging and monitor for unauthorized swimlane access patterns
🔍 How to Verify
Check if Vulnerable:
Check if your Kanboard version is below 1.2.50. The vulnerability exists in all versions prior to this release.Check Version:
Check the version in Kanboard's web interface under Settings > About, or examine the version constant in app/constants.phpVerify Fix Applied:
After upgrading to 1.2.50 or later, test that authenticated users can only access swimlane data from projects they have explicit permission to view.📡 Detection & Monitoring
Log Indicators:
- Multiple API calls to getSwimlane method from single user across different project IDs
- getSwimlane API calls returning data for projects the user shouldn't access
Network Indicators:
- Unusual patterns of API requests to /jsonrpc.php with getSwimlane method
SIEM Query:
source="kanboard_logs" AND method="getSwimlane" | stats count by user_id, project_id | where count > threshold