CVE-2026-6599

MEDIUM 6.3

langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-74 CWE-707
Vendor	langflow-ai
Product	langflow
Published	Apr 20, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

langflow-ai / langflow

1.8.0 1.8.1 1.8.2 1.8.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/358234 vuldb.com: https://vuldb.com/vuln/358234/cti vuldb.com: https://vuldb.com/submit/791922 gist.github.com: https://gist.github.com/chenhouser2025/a909c47316b7a0948ee68c109ab747a3

Credits

🔍 Eric-f (VulDB User) VulDB CNA Team