High severity · published Oct 5, 2026
CVE-2026-105741
Langflow: IP Spoofing Bypass via `X-Forwarded-For` Allowing Remote Configuration Write
7.1
CVSS
0.2%
EPSS
No
On KEV
Description
Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.5.0 until 1.10.3, an IP spoofing vulnerability in the Model Context Protocol (MCP) configuration installation endpoint (POST /api/v1/mcp/project/{project_id}/install) allowed authenticated remote attackers to bypass the "local-only" access restriction. By sending a spoofed X-Forwarded-For: 127.0.0.1 header, an attacker could make the server treat the request as originating from localhost, letting them write/overwrite an MCP client configuration file on the server's filesystem. This vulnerability is fixed in 1.10.3.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LA
langflow · langflow-ai
>= 1.5.0, < 1.10.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105741
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105741
x_refsource_CONFIRM
https://github.com/langflow-ai/langflow/security/advisories/GHSA-4f6c-2vvp-gw82
x_refsource_MISC
https://github.com/langflow-ai/langflow/pull/13915
x_refsource_MISC
https://github.com/langflow-ai/langflow/commit/1f39a4b9d62c9dfa1b21fa7f85e23a180c351b72
x_refsource_MISC
https://github.com/langflow-ai/langflow/commit/94859df33acd70b2a1f816e26d68f5e89a7e5639
x_refsource_MISC
https://github.com/langflow-ai/langflow/releases/tag/v1.10.3
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