CVE-2026-6599 | langflow-ai langflow up to 1.8.3 Model Context Protocol Configuration API mcp_projects.py get_client_ip/install_mcp_config X-Forwarded-For injection

VDB-358234 · SUBMIT #791922 · CVE-2026-6599 LANGFLOW-AI LANGFLOW UP TO 1.8.3 MODEL CONTEXT PROTOCOL CONFIGURATION API MCP_PROJECTS.PY GET_CLIENT_IP/INSTALL_MCP_CONFIG X-FORWARDED-FOR INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.6 $0-$5k 2.65+ Summaryinfo A vulnerability, which was classified as critical, was found in langflow-ai langflow up to 1.8.3. This affects 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. Executing a manipulation of the argument X-Forwarded-For can lead to injection. The identification of this vulnerability is CVE-2026-6599. The attack may be launched remotely. Furthermore, there is an exploit available. The application of restrictive firewalling is recommended. The vendor was contacted early about this disclosure but did not respond in any way. Detailsinfo A vulnerability was found in langflow-ai langflow up to 1.8.3. It has been declared as critical. This vulnerability affects 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. The manipulation of the argument X-Forwarded-For with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The advisory is available at gist.github.com. This vulnerability was named CVE-2026-6599. The exploitation appears to be easy. The attack can be initiated remotely. Technical details and also a public exploit are known. This vulnerability is assigned to T1055 by the MITRE ATT&CK project. It is possible to download the exploit at gist.github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. Proper firewalling of is able to address this issue. Productinfo Type Artificial Intelligence Software Vendor langflow-ai Name langflow Version 1.8.0 1.8.1 1.8.2 1.8.3 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 5.6 VulDB Base Score: 6.3 VulDB Temp Score: 5.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Injection CWE: CWE-74 / CWE-707 / CWE-20 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Firewall Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/19/2026 Advisory disclosed 04/19/2026 +0 days VulDB entry created 04/19/2026 +0 days VulDB entry last update Sourcesinfo Advisory: gist.github.com Status: Not defined CVE: CVE-2026-6599 (🔒) GCVE (CVE): GCVE-0-2026-6599 GCVE (VulDB): GCVE-100-358234 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 04/19/2026 15:52 Changes: 04/19/2026 15:52 (60) Complete: 🔍 Submitter: Eric-f Cache ID: 99:D7E:101 Submitinfo Accepted Submit #791922: Langflow <= 1.8.3 Authentication Bypass by Spoofing (by Eric-f) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸