CVE-2026-6599
langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection
- State
- Published
- Severity
- 5.3 Medium
- Published
- Apr 20, 2026
- Updated
- Apr 20, 2026
- Reserved
- Apr 19, 2026
Description
A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function get_client_ip/install_mcp_config of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument X-Forwarded-For results in injection. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 6.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:W/RC:R | VulDB |
| 3.0 | 6.3 Medium | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:W/RC:R | VulDB |
| 2.0 | 6.5 Medium | AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:W/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
langflowlangflow-ai |
|
References
- VDB-358234 | langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injectionvdb-entrytechnical-description
- VDB-358234 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
- Submit #791922 | Langflow <= 1.8.3 Authentication Bypass by Spoofingthird-party-advisory
- https://gist.github.com/chenhouser2025/a909c47316b7a0948ee68c109ab747a3exploit
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.