CVE-2026-7663 | IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthentic… | CVSS 9.1 CRITICAL

Description

IBM Langflow OSS 1.0.0 through 1.9.6 could allow unauthenticated attackers to access protected MCP project resources and execute MCP operations due to improper authorization enforcement in the Streamable MCP transport endpoint.

Metadata

CVE ID: CVE-2026-7663
State: PUBLISHED
Assigner: ibm
Reserved: 2026-05-01 19:43 UTC
Published: 2026-06-30 19:16 UTC
Last updated: 2026-06-30 20:09 UTC
Primary CWE: CWE-285
CWE-285 Improper Authorization
Vendor / Product: IBM / Langflow OSS
Sources: cve.org · NVD

Severity & Metrics

9.1 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
IBM	Langflow OSS	—	1.0.0 ≤ 1.9.6

Weakness (CWE)

CWE	Source	Description
CWE-285	cna	CWE-285 Improper Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.1	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References (1)

https://www.ibm.com/support/pages/node/7277570