CVE-2026-6599
published 2026-04-20CVE-2026-6599: 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…
PriorityP345medium6.3CVSS 3.1
AVNACLPRLUINSUCLILAL
EPSS
0.23%
14.0th percentile
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
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| langflow-ai | langflow | — | — |
| langflow-ai | langflow | — | — |
| langflow-ai | langflow | — | — |
| langflow-ai | langflow | — | — |
| langflow | langflow | 0 – 1.8.3 | — |
CVSS provenance
nvdv3.16.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
nvdv4.02.1LOWCVSS: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
nvdv2.06.5MEDIUMAV:N/AC:L/Au:S/C:P/I:P/A:P
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GHSA
Langflow vulnerable to injection
ghsa·2026-04-20
CVE-2026-6599 [LOW] CWE-74 Langflow vulnerable to injection
Langflow vulnerable to injection
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.
GHSA
GHSA-v66p-f7x3-4794: A vulnerability was detected in langflow-ai langflow up to 1
ghsa_unreviewed·2026-04-20
CVE-2026-6599 [MEDIUM] CWE-74 GHSA-v66p-f7x3-4794: A vulnerability was detected in langflow-ai langflow up to 1
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.
VulDB
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
vuldb·2026-04-19
CVE-2026-6599 [CRITICAL] 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
A vulnerability, which was classified as critical, has been found 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.
This vulnerability was named CVE-2026-6599. The attack may be initiated remotely. In addition, an exploit is available.
It is suggested to use restrictive firewalling.
The vendor was contacted early about this disclosure but did not respond in any way.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-04-20
Published