CVE-2026-107327

Langflow missing authorization permits code execution

IBM / Langflow · Langflow OSS

First documented disclosure · Review checkpoint

Summary

Code execution with the vulnerable service’s permissions.

Severity and exploitation evidence

Critical · 9.9/10 · CVSS 3.1. Severity source.

Exploitation not established: The reviewed primary records do not establish malicious exploitation or a confirmed victim.

Exploitation evidence source

Technical severity is not a measure of observed attacks or of risk to your deployment. Attempts, demonstrations, and successful compromise retain the qualifications in the source.

How the weakness works

An execution-capable operation lacks its required authorization check; IBM does not name the exact operation.

Conditions required

Remote authenticated access; authentication does not supply the missing authorization.

Potential impact

Code execution with the vulnerable service’s permissions.

Affected versions and configurations

IBM lists Langflow OSS 1.0.0 through 1.12.4.

Fix and mitigation status

1.12.5 per IBM; this is an issue-specific fix, not assurance that the old release addresses later findings.

Practical next steps

Upgrade to a current supported release containing the fix; back up the deployment and validate workflow behavior. Where MCP stdio is used, IBM additionally requires interpreter hardening and administrator-only controls; configuration changes do not replace upgrading.

Operating lesson

Check execution privilege on the final server operation.

Evidence and limits

IBM bulletin 7293016 was initially published 2026-10-19; the CNA record followed on 2026-10-29. Earlier upstream patches are not assigned to this CVE by inference. Exact technical details absent from the public record remain unknown; a CVSS score is not an observed incident.

Sources