What is CVE-2026-9202?

CVE-2026-9202 is a critical-severity vulnerability in IBM Langflow Oss, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-07-17.

How severe is CVE-2026-9202?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-9202

IBM Langflow OSS 1.0.0 through 1.10.0 allows unauthenticated attackers to create unlimited user accounts on any Langflow instance; when NEW_USER_IS_ACTIVE=true (documented deployment option), newly created accounts are immediately active and can authenticate to reach RCE endpoints, bypassing the need for AUTO_LOGIN.

Vulnerability class: Broken Authentication

Published 2026-07-17 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.1th percentile), scored 2026-10-24.

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/7278929 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-9202?: CVE-2026-9202 is a critical-severity vulnerability in IBM Langflow Oss, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2026-07-17.
How severe is CVE-2026-9202?: Critical severity. CVSS v3 base score is 9.8 out of 10.