What is CVE-2026-8446?

CVE-2026-8446 is a high-severity vulnerability in IBM Langflow Oss, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-08-05.

How severe is CVE-2026-8446?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-8446

IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcp_composer_enabled=true (default) and projects are configured with auth_type=oauth .

Vulnerability class: Broken Authentication

Published 2026-08-05 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.1th percentile), scored 2026-11-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

IBM Langflow Oss — versions 1.0.0
Langflow

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

www.ibm.com/support/pages/node/7282147 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8446?: CVE-2026-8446 is a high-severity vulnerability in IBM Langflow Oss, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-08-05.
How severe is CVE-2026-8446?: High severity. CVSS v3 base score is 7.5 out of 10.