EUVD-2026-23762Severity by source
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/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
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CVSS VectorNVD
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/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
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8DescriptionCVE.org
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.
AnalysisAI
Code injection in langflow-ai langflow up to version 1.8.3 allows authenticated remote attackers to execute arbitrary code via manipulation of the X-Forwarded-For HTTP header in the Model Context Protocol Configuration API endpoint. The vulnerability affects the get_client_ip function in src/backend/base/langflow/api/v1/mcp_projects.py and has publicly available exploit code; the vendor did not respond to early disclosure notification.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires PR:L (authenticated access) - the attacker must possess valid credentials to access the langflow instance and reach the Model Context Protocol Configuration API endpoints. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 6.3 with vector AV:N/AC:L/PR:L indicates authenticated network-based access with low attack complexity and limited impact (confidentiality, integrity, availability). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated user with access to a langflow instance crafts an HTTP request to the Model Context Protocol Configuration API (install_mcp_config endpoint) with a malicious X-Forwarded-For header containing Python code injection payloads. The vulnerable get_client_ip function extracts and processes this header without sanitization, passing it downstream where it is evaluated in an unsafe context. … |
| Remediation | Upgrade langflow to a version released after 1.8.3 that includes a patch for the X-Forwarded-For header injection vulnerability; however, no specific patched version is confirmed in available data due to lack of vendor response. … Detailed patch versions, workarounds, and compensating controls in full report. |
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