CVE-2026-7664: CWE-287 Improper Authentication in IBM Langflow OSS
IBM Langflow OSS versions 1.0.0 through 1.8.4 contain an improper authentication vulnerability in the Streamable MCP transport endpoint. This flaw allows unauthenticated attackers to access protected MCP project resources and execute MCP operations. The vulnerability is classified as CWE-287 (Improper Authentication) and has a critical severity with a CVSS score of 9.8.
AI Analysis
Technical Summary
CVE-2026-7664 is an improper authentication vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.8.4. Due to insufficient authorization enforcement in the Streamable MCP transport endpoint, unauthenticated attackers can gain access to protected MCP project resources and perform MCP operations without valid credentials. This vulnerability poses a critical risk as it compromises confidentiality, integrity, and availability of the affected system components.
Potential Impact
Successful exploitation of this vulnerability allows unauthenticated attackers to fully compromise MCP project resources by bypassing authentication controls. This leads to complete loss of confidentiality, integrity, and availability of the affected resources and operations within IBM Langflow OSS.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented at this time. Users should monitor IBM's security advisories for updates and apply patches promptly once available.
CVE-2026-7664: CWE-287 Improper Authentication in IBM Langflow OSS
Description
IBM Langflow OSS versions 1.0.0 through 1.8.4 contain an improper authentication vulnerability in the Streamable MCP transport endpoint. This flaw allows unauthenticated attackers to access protected MCP project resources and execute MCP operations. The vulnerability is classified as CWE-287 (Improper Authentication) and has a critical severity with a CVSS score of 9.8.
CVSS v3.1
Score 9.8critical
Affected software
cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*cpe:2.3:a:ibm:langflow_oss:1.8.4:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-7664 is an improper authentication vulnerability in IBM Langflow OSS affecting versions 1.0.0 through 1.8.4. Due to insufficient authorization enforcement in the Streamable MCP transport endpoint, unauthenticated attackers can gain access to protected MCP project resources and perform MCP operations without valid credentials. This vulnerability poses a critical risk as it compromises confidentiality, integrity, and availability of the affected system components.
Potential Impact
Successful exploitation of this vulnerability allows unauthenticated attackers to fully compromise MCP project resources by bypassing authentication controls. This leads to complete loss of confidentiality, integrity, and availability of the affected resources and operations within IBM Langflow OSS.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround has been documented at this time. Users should monitor IBM's security advisories for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- ibm
- Date Reserved
- 2026-05-01T19:46:59.287Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39572aeed863c81e053837
Added to database: 06/22/2026, 15:39:22 UTC
Last enriched: 06/22/2026, 15:57:02 UTC
Last updated: 06/22/2026, 19:58:49 UTC
Views: 12
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