What is CVE-2026-17627?

CVE-2026-17627 is a medium-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.9/10. Published 2026-09-04.

How severe is CVE-2026-17627?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-17627

IBM Langflow OSS 1.0.0 through 1.10.2 could allow a remote authenticated attacker to obtain sensitive information and inject messages into workflow history due to improper authorization.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-09-04 · last modified 2026-09-09.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (9.1th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

www.ibm.com/support/pages/node/7286294 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-17627?: CVE-2026-17627 is a medium-severity vulnerability in IBM Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.9/10. Published 2026-09-04.
How severe is CVE-2026-17627?: Medium severity. CVSS v3 base score is 4.9 out of 10.