Vulnerability details

CVE-2026-7663

IBM Langflow OSS

Unauthenticated Cross-User MCP Resource Access and Tool Execution via Streamable Transport Authorization Bypass

CVSS 3.1

9.1Critical

Official 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.

CVSS scores

Score	Version	Source	Vector
9.1Critical	3.1	CVEProject cvelistV5 (CNA) (ibm)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
IBM	Langflow OSS	1.0.0 ≤ v ≤ 1.9.6	CVEProject cvelistV5 (CNA)

References and advisories

https://www.ibm.com/support/pages/node/7277570 vendor-advisorypatch

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Details

Published: 2026-06-30
Last updated: 2026-07-01
State: Published
Assigner (CNA): ibm

Exploit prediction (EPSS)

0.52%

Probability of exploitation in 30 days

44.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-285
Improper Authorization