IBM Langflow OSS 1.0.0 through 1.12.4 could allow a remote attacker with a low-privileged authenticated account to bypass the administrator-only restriction and execute arbitrary code on the server by configuring a built-in code-execution component with attacker-supplied inputs.
High risk because a low-privilege account may enable server-side code execution; exploitation status cannot be confirmed because KEV, SSVC, PoC and EPSS indicators were not provided.
Successful exploitation could let an attacker access sensitive data, alter workflows or disrupt the service. Where the Langflow host can reach internal systems or holds deployment credentials, the compromise may also support follow-on activity; the extent depends on host permissions and network segmentation.
### Most likely attack path
The service must be network-reachable, and the attacker needs a valid low-privilege account, but exploitation requires no victim interaction and has low complexity. Code execution is assessed as remaining within the application’s security scope, though the attacker may still leverage the server’s existing access to pursue other resources.
### Who is most exposed
Prioritise internet-facing or broadly accessible Langflow deployments, especially shared AI workflow environments with user accounts, sensitive integrations or MCP stdio enabled.
Alert on non-admin changes to code-execution components or related workflow settings.
Review Langflow and host logs for unexpected child processes, shells or scripting runtimes.
Investigate unusual outbound connections and access to secrets or internal services from the Langflow host.
### Mitigation and prioritisation
Upgrade promptly to the vendor-fixed release; back up first and test flows and release-specific configuration changes.
For MCP stdio deployments, set `LANGFLOW_MCP_SERVER_INTERPRETER_HARDENING=true` and `LANGFLOW_CUSTOM_COMPONENT_ADMIN_ONLY=true`; restart and validate workflows.
Keep custom components restricted on public workflows; avoid enabling public custom-component execution.
Until upgraded, restrict network access and account creation, and review existing low-privilege accounts and permissions.
A considerable amount of time and effort goes into maintaining this website, creating backend automation and creating new features and content for you to make actionable intelligence decisions. Everyone that supports the site helps enable new functionality.
If you like the site, please support us on Patreon or Buy Me A Coffee using the buttons below.
The full story
This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.
