CVE-2026-12763 is a vulnerability in IBM Langflow Oss
Published on September 14, 2026
Langflow is vulnerable to authentication bypass and insufficient session expiration
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.
Vulnerability Analysis
CVE-2026-12763 can be exploited with network access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
Missing Authentication for Critical Function
The software does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
Products Associated with CVE-2026-12763
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Affected Versions
IBM Langflow OSS:- Version 1.0.0, <= 1.11.5 is affected.