What is CVE-2026-81211?

CVE-2026-81211 is a high-severity vulnerability in IBM Langflow Oss, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-09-10.

How severe is CVE-2026-81211?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in IBM Langflow Oss

CVE-2026-81211

IBM Langflow OSS 1.0.0 through 1.11.5 could allow a remote authenticated attacker to execute arbitrary Python code due to improper authorization of custom components in stored flows.

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ibm Langflow Oss

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

psirt@us.ibm.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-81211?: CVE-2026-81211 is a high-severity vulnerability in IBM Langflow Oss, classified under Missing Authorization. CVSS score: 8.8/10. Published 2026-09-10.
How severe is CVE-2026-81211?: High severity. CVSS v3 base score is 8.8 out of 10.