Vulnerability details

CVE-2026-7664

IBM Langflow OSS

Unauthenticated Flow Execution via Webhook Endpoint in Langflow OSS

CVSS 3.1

9.8Critical

Official description

IBM Langflow OSS 1.0.0 through 1.8.4 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
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (ibm)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
IBM	Langflow OSS	1.0.0 ≤ v ≤ 1.8.4	CVEProject cvelistV5 (CNA)

References and advisories

https://www.ibm.com/support/pages/node/7277243 vendor-advisorypatch

Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published: 2026-06-22
Last updated: 2026-06-23
State: Published
Assigner (CNA): ibm

Exploit prediction (EPSS)

0.49%

Probability of exploitation in 30 days

42.8%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-287
Improper Authentication