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Langflow Shareable Playground allows unauthenticated remote code execution

The Shareable Playground feature in Langflow allows unauthenticated users to execute arbitrary Python code via the `/api/v1/build_public_tmp` route by manipulating the `data.

17 Jun 2026Read 1 minSeverity: act now

What changed

The Shareable Playground feature in Langflow allows unauthenticated users to execute arbitrary Python code via the `/api/v1/build_public_tmp` route by manipulating the `data.nodes[X].data.node.template.code.value` field in the JSON payload.

Who it affects

Any Langflow deployment that has enabled the Shareable Playground (Public Flows) feature.

What to do today

Disable the Shareable Playground feature immediately or restrict access to the `/api/v1/build_public_tmp` endpoint until a patch is applied.

The trail
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