---
id: "CVE-2026-104316"
kind: "vulnerability"
aliases: ["CVE-2026-104316"]
title: "Langflow: any logged-in user can cancel other users' running workflows"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "ai-tooling"
products: []
ecosystems: []
tags: ["ai-agents", "ai-tooling", "langflow", "self-hosted"]
not_affected_if: ["single-user-instance", "version-above-1.12.3"]
published_at: "2026-10-29T16:17:43+00:00"
first_seen_at: "2026-10-29T16:25:54+00:00"
updated_at: "2026-10-29T16:31:26+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104316", "first_seen_at": "2026-10-29T16:25:54+00:00"}]
---

# Langflow: any logged-in user can cancel other users' running workflows

Langflow OSS versions 1.0.0 through 1.12.3 lack a permission check on the endpoint that cancels background workflow jobs. An attacker with a valid account can stop another user's running flow with one HTTP request, losing that work in progress.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Langflow version, for example with `pip show langflow` or the image tag in your deployment.
- Confirm whether multiple user accounts can log in to your Langflow instance.

## Fix

- Move Langflow OSS to a version later than `1.12.3`; the source does not name the exact fixed release.

## Timeline

- 2026-10-29T16:25:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-104316

## From the sources

IBM Langflow OSS 1.0.0 through 1.12.3 could allow an authenticated attacker to cancel any victim's running background workflow job by sending a single HTTP request, resulting in loss of in-progress compute work with no flow-level permission check.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_