What’s Vulnerable › Vulnerabilities

CVE-2026-6599: langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-20 · updated 2026-06-17
• Weakness: CWE-74

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.

Affected products

• IBM Langflow OSS: 1.8.0, 1.8.1, 1.8.2, 1.8.3

References

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

Get alerted when CVE-2026-6599 or the next vulnerability affects your stack