What is CVE-2026-6542?

CVE-2026-6542 is a medium-severity vulnerability in Ibm Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-30.

How severe is CVE-2026-6542?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Ibm Langflow Oss

CVE-2026-6542

IBM Langflow OSS 1.0.0 through 1.8.4 could allow any user to supply a flow_id to read transaction logs and vertex build data belonging to other users, and to delete persisted vertex build data for another user's flow.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.001 (16.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Ibm Langflow Oss — versions 1.0.0
Langflow

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

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

Frequently asked questions

What is CVE-2026-6542?: CVE-2026-6542 is a medium-severity vulnerability in Ibm Langflow Oss, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-30.
How severe is CVE-2026-6542?: Medium severity. CVSS v3 base score is 6.5 out of 10.