What is CVE-2026-107366?

CVE-2026-107366 is a high-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.3/10. Published 2026-10-20.

How severe is CVE-2026-107366?

High severity. CVSS v3 base score is 8.3 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-107366

IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-10-20 · last modified 2026-10-20.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

IBM Langflow Oss

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

www.ibm.com/support/pages/node/7293016 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-107366?: CVE-2026-107366 is a high-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.3/10. Published 2026-10-20.
How severe is CVE-2026-107366?: High severity. CVSS v3 base score is 8.3 out of 10.