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IBM Langflow OSS EUVDEUVD-2026-71215

| CVE-2026-9186 MEDIUM
Improper Access Control (CWE-284)
2026-09-04 ibm GHSA-gqfh-c8pj-64mr
Authentication Bypass IBM Langflow Oss
6.5
CVSS 3.1 · Vendor: ibm
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Severity by source

Vendor (ibm) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
vuln.today AI
6.5 MEDIUM

Network-reachable, low-complexity header spoof requires only a valid account (PR:L); direct impact is config file writes (I:H) with no confidentiality or availability effect.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (ibm).

CVSS VectorVendor: ibm

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

1
Analysis Generated
Sep 04, 2026 - 15:06 vuln.today

DescriptionCVE.org

IBM Langflow OSS 1.0.0 through 1.11.2 allows remote authenticated attackers to bypass localhost-only MCP configuration installation by spoofing X-Forwarded-For: 127.0.0.1 header, enabling arbitrary writes to IDE config files (~/.cursor/mcp.json, etc.).

AnalysisAI

Arbitrary IDE configuration file writes in IBM Langflow OSS 1.0.0 through 1.11.2 are achievable by authenticated remote attackers who spoof the X-Forwarded-For HTTP header to impersonate a localhost connection, bypassing the platform's IP-based restriction on MCP (Model Context Protocol) server configuration installation. The direct impact is unauthorized writes to files such as ~/.cursor/mcp.json, which define MCP server endpoints loaded by AI-integrated IDEs; a malicious entry in these files can redirect the IDE to an attacker-controlled MCP server, enabling downstream code execution within the developer's environment. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated account on the IBM Langflow OSS instance (PR:L per CVSS vector) - no special privilege level beyond basic login is indicated. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) is well-calibrated: network-exploitable, low complexity, requires authentication, and produces a high-integrity write impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the vendor-released patch as documented in IBM advisory 7285646 at https://www.ibm.com/support/pages/node/7285646; the exact patched version number is not independently confirmed from the available input data, so consult the advisory directly for the target upgrade version. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-71215 vulnerability details – vuln.today
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