CVE-2026-6599

EUVD-2026-23762 · Published Apr 20, 2026

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.

Technologies

Langflow Langflow

Weaknesses

CWE-74CWE-707

CVSS scores

v4.02.1CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
v3.16.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
v2.06.5AV:N/AC:L/Au:S/C:P/I:P/A:P

MITRE ATT&CK

Inferred

Where this vulnerability fits in an attack

ReconImpact

Initial Access Execution Stealth Defense Impairment

T1190Exploit Public-Facing Application T1027Obfuscated Files or Information T1574.006Dynamic Linker Hijacking T1574.007Path Interception by PATH Environment Variable T1690Prevent Command History Logging

References

Potentially impacted assets

See if this affects your attack surface