CVE-2026-6599 Details
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.
A vulnerability allowing IP spoofing has been identified in the Langflow application, specifically in versions through 1.8.3. The issue arises in the Model Context Protocol (MCP) Configuration API, within the 'get_client_ip' function of 'src/backend/base/langflow/api/v1/mcp_projects.py'. This vulnerability allows authenticated remote attackers to bypass local-only access restrictions by manipulating the 'X-Forwarded-For' header. The application fails to properly validate this header, enabling attackers to spoof their IP address as '127.0.0.1' and gain unauthorized access to administrative functions that should only be available to local users.
It is recommended to implement proper firewall rules to block unauthorized access and prevent exploitation of this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 20, 2026CISA-ADP
Assessed Apr 20, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://gist.github.com/chenhouser2025/a909c47316b7a0948ee68c109ab747a3 | [email protected] | ExploitTechnical Description |
| https://vuldb.com/submit/791922 | [email protected] | Technical Description |
| https://vuldb.com/vuln/358234 | [email protected] | AdvisoryExploitRemedy |
| https://vuldb.com/vuln/358234/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-707 | Improper Neutralization | [email protected] |
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| langflow-ai langflow | <= 1.8.3 (semver) |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Apr 20, 2026 | New CVE Received | [email protected] |