CVE-2026-19875 Unauthenticated Registration POST Endpoint Permits Admin Email Overwrite and Outbound Relay Abuse in Langflow

What is CVE-2026-19875?

CVE-2026-19875 is a high-severity missing authorization vulnerability in Langflow Langflow, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator email information and abuse the server as an outbound relay due to missing authentication for the registration endpoint.

Weakness: CWE-306

Which versions are affected by CVE-2026-19875?

It affects 1 product.

Products include Langflow Langflow.

How do I fix CVE-2026-19875?

No fix has been published for CVE-2026-19875 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-2026-19875 being exploited?

There is no known exploitation of CVE-2026-19875 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-w32j-3vcp-72g3.