What is CVE-2026-10140?

CVE-2026-10140 is a critical-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.6/10. Published 2026-06-30.

How severe is CVE-2026-10140?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-10140

IBM Langflow OSS 1.0.0 through 1.10.0 voice mode contains improper shared-state handling that allows reuse of API clients across tenant boundaries. An authenticated attacker can manipulate cache state to cause requests from other users to be processed using incorrect upstream API credentials, leading to cross-tenant billing and accountability misattribution.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-06-30 · last modified 2026-08-11.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

IBM Langflow Oss — versions 1.0.0
Langflow

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

www.ibm.com/support/pages/node/7278209 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-10140?: CVE-2026-10140 is a critical-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.6/10. Published 2026-06-30.
How severe is CVE-2026-10140?: Critical severity. CVSS v3 base score is 9.6 out of 10.