CVE-2026-17627 Langflow is affected by improper authorization due to missing access control on the voice-mode WebSocket endpoint

What is CVE-2026-17627?

CVE-2026-17627 is a medium-severity missing authorization vulnerability in Langflow Langflow, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-639

Which versions are affected by CVE-2026-17627?

It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-17627?

No fix has been published for CVE-2026-17627 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-17627 being exploited?

There is no known exploitation of CVE-2026-17627 in the wild and no public exploit code.

Other vulnerabilities in Langflow Langflow

• CVE-2026-9198 IBM Langflow Code Injection Exploited Critical 9.8
• CVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Exploited Critical 9.8
• CVE-2025-3248 Langflow Missing Authentication Exploited Critical 9.8
• CVE-2025-34291 Langflow Origin Validation Error Exploited Critical 9.4
• CVE-2026-33017 Langflow Code Injection Exploited Critical 9.3

All Langflow Langflow vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-g3x9-hm5j-gv7w.