CVE-2026-12763

Received Received - Intake

IBM Langflow OSS MCP Server Context Exposure

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: IBM Corporation

Description

IBM Langflow OSS 1.0.0 through 1.11.5 could allow an authenticated attacker to access another user's MCP server context due to improper cache key isolation in the MCP Tools component.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-14

Generated

2026-09-15

AI Q&A

2026-09-15

EPSS Evaluated

N/A

NVD

CVE-2026-12763

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	langflow_oss	From 1.0.0 (inc) to 1.11.5 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.11.5 have a vulnerability where an authenticated attacker could access another user's MCP server context due to improper cache key isolation in the MCP Tools component.

Impact Analysis

This vulnerability could allow an attacker to access sensitive data or operations associated with another user's MCP server context, potentially leading to unauthorized access or data exposure.

Compliance Impact

This vulnerability may lead to unauthorized data access, which could violate compliance requirements such as GDPR or HIPAA, depending on the data involved.

Mitigation Strategies

Update IBM Langflow OSS to a version beyond 1.11.5 to address the improper cache key isolation in the MCP Tools component. Ensure only authenticated users have access to MCP server contexts and review cache configurations for isolation issues.

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