CVE-2026-12763: CWE-306 Missing Authentication for Critical Function in IBM Langflow OSS
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.
AI Analysis
Technical Summary
CVE-2026-12763 affects IBM Langflow OSS versions 1.0.0 through 1.11.5. The vulnerability arises from improper cache key isolation in the MCP Tools component, which allows an authenticated attacker with low privileges to access another user's MCP server context. This represents a missing authentication control for a critical function (CWE-306). The attack vector is network-based with high attack complexity and no user interaction required. The vulnerability impacts confidentiality and integrity to a limited extent but does not affect availability.
Potential Impact
An authenticated attacker with low privileges can access another user's MCP server context, potentially exposing sensitive information or allowing limited unauthorized actions within that context. The impact on confidentiality and integrity is low, and there is no impact on availability.
Mitigation Recommendations
No official patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated users and monitor for unusual access patterns related to MCP server contexts.
CVE-2026-12763: CWE-306 Missing Authentication for Critical Function in IBM Langflow OSS
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 v3.1
Score 4.2medium
Affected software
IBM
Langflow OSS
cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:langflow_oss:1.11.5:*:*:*:*:*:*:*Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-12763 affects IBM Langflow OSS versions 1.0.0 through 1.11.5. The vulnerability arises from improper cache key isolation in the MCP Tools component, which allows an authenticated attacker with low privileges to access another user's MCP server context. This represents a missing authentication control for a critical function (CWE-306). The attack vector is network-based with high attack complexity and no user interaction required. The vulnerability impacts confidentiality and integrity to a limited extent but does not affect availability.
Potential Impact
An authenticated attacker with low privileges can access another user's MCP server context, potentially exposing sensitive information or allowing limited unauthorized actions within that context. The impact on confidentiality and integrity is low, and there is no impact on availability.
Mitigation Recommendations
No official patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to authenticated users and monitor for unusual access patterns related to MCP server contexts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-06-19T22:10:15.764Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa85d5755bf5e2cf598a1d0
Added to database: 09/14/2026, 20:47:19 UTC
Last enriched: 09/14/2026, 21:03:16 UTC
Last updated: 09/15/2026, 07:01:23 UTC
Views: 6
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