If a Langflow instance or one of its credentials may have been exposed, treat the event as a full credential incident: isolate the service, preserve evidence, revoke Langflow API keys, replace any environment key, migrate LANGFLOW_SECRET_KEY, rotate every provider credential used by flows, and redeploy clients. Changing one value is not enough because Langflow stores several independent credential classes.
What must be rotated
Langflow uses three credential categories, and each has a different revocation path. Inventory them before making changes so that a forgotten webhook, CI job, or model-provider token does not keep the compromise alive.
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| Credential | What it controls | Where to rotate it | Important limitation |
|---|---|---|---|
| Langflow API keys | Authentication to the Langflow API | Langflow UI for database-backed keys, or the deployment environment for an environment-backed key | Keys inherit the privileges of the user who created them. A superuser key should be treated as a broad compromise. |
| Component/provider keys | Model providers, databases, vector stores, webhooks, cloud services, and other integrations used by flows | At the provider or service that issued the credential | Deleting a Langflow variable does not revoke the provider’s actual key. |
| Authentication environment variables | Values such as LANGFLOW_API_KEY and LANGFLOW_SECRET_KEY |
Deployment secret store or environment, followed by a restart or migration as applicable | LANGFLOW_API_KEY_SOURCE=env accepts one key; successful authentication grants superuser privileges. |
LANGFLOW_SECRET_KEY is especially sensitive. Langflow uses it for Fernet encryption of sensitive values and for HS256 JWT signing. A replacement therefore protects stored encrypted data only when the encrypted records are migrated correctly, and it invalidates existing JWT sessions.
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Contain the suspected compromise first
Do not begin by editing keys while an attacker can still reach the instance. Restrict ingress at the firewall, load balancer, security group, or reverse proxy; stop untrusted traffic; and preserve logs, deployment manifests, environment configuration, container metadata, and database snapshots for investigation. Keep an untouched copy of the old configuration in protected forensic storage.
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Langflow warns: “Never expose Langflow ports directly to the internet without proper security measures.” Put the service behind an authenticated reverse proxy or API gateway, disable automatic login, and ensure the instance uses a non-default secret key. If you cannot establish which container or host is trusted, isolate it and build a clean replacement rather than continuing to operate it during rotation.
Preserve useful evidence
- Export access, reverse-proxy, application, CI/CD, and cloud-audit logs before retention policies remove them.
- Record the running image or package version, process arguments, mounted volumes, and the exact environment-source locations for secrets.
- Capture the list of active users, API keys, integrations, webhooks, and scheduled jobs.
- Hash or otherwise protect evidence copies, and restrict access to the old-key backup and configuration files.
Inventory every credential and trust path
Search flow definitions, global variables, folders, webhook configurations, deployment manifests, notebooks, scripts, and CI/CD settings. Classify each value as a Langflow API key, a provider credential, a webhook secret, a database password, a cloud token, or a signing/encryption secret. Note the owner, privilege level, location, consumers, and replacement procedure.
Pay particular attention to keys created by administrators. Langflow API keys inherit the creating user’s privileges, so a leaked key belonging to a superuser can expose every operation available to that account. Also list all clients that may cache credentials: browser sessions, command-line scripts, automation runners, webhooks, SDK applications, and other Langflow instances.
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For the normal database-backed mode, where LANGFLOW_API_KEY_SOURCE=db, revoke keys in the Langflow interface. The deletion takes effect immediately; Langflow states that “This action immediately invalidates the key and prevents it from being used again.”
- Sign in through the protected administrative endpoint.
- Open the profile icon.
- Select Settings.
- Open Langflow API Keys.
- Select every key that may have been exposed, including keys belonging to accounts that no longer appear active.
- Choose Delete and confirm the operation.
- Record which keys were revoked and the time of revocation for the incident timeline.
Create replacement keys only after containment. Give each client its own key where possible, apply the least privilege available, and store replacements in a secret manager rather than in source code, flow exports, shell history, or plain-text deployment files.
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Rotate an environment-backed Langflow API key
Some deployments set LANGFLOW_API_KEY_SOURCE=env. In this mode Langflow validates one value from LANGFLOW_API_KEY. A successful authentication grants superuser privileges, so this key must be handled as a high-impact administrative secret.
- Generate a replacement value using your approved secret-management process.
- Update
LANGFLOW_API_KEYin the deployment secret, orchestration secret, or protected environment source. - Confirm that the new value is not exposed in rendered manifests, process listings, build logs, or shell history.
- Restart or redeploy Langflow so the process reads the replacement.
- Update every client that sends the environment-backed key.
- Test a protected endpoint with the new key, then test the old key and confirm it receives an unauthorized response.
Changing a database-backed key in the UI does not change an environment-backed key, and changing LANGFLOW_API_KEY does not revoke database-backed keys. Handle both paths if the deployment has used both modes over time.
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Safely migrate LANGFLOW_SECRET_KEY
Stop Langflow before changing this value. Do not simply overwrite the environment variable: encrypted records created with the old key must be re-encrypted, and JWT signing must move to the new key in a controlled transaction.
Run the migration preview
- Stop every Langflow process that reads the configuration. In a multi-instance deployment, prevent any instance from starting with a mixed key set.
- From the Langflow installation directory, run
uv run python scripts/migrate_secret_key.py --dry-run - Review the preview, including the configuration directory, the records to be re-encrypted, and the proposed backup location.
Apply the migration
- Run
uv run python scripts/migrate_secret_key.py - Confirm that the command completes without errors.
- Restart Langflow with the migrated configuration and the new key.
- Start only one instance first, validate it, and then roll the same configuration through the remaining instances.
The migration policy covers encrypted values in user.store_api_key, variable.value, and folder.auth_settings. The script reads the current key, generates a new one, re-encrypts sensitive data in an atomic transaction, backs up the old key as <config-dir>/secret_key.backup.<timestamp>, and saves the new key. If migration fails, the transaction rolls back and the key files remain untouched.
Protect the backup as incident material. Anyone who obtains the old key and the associated encrypted data may gain access to secrets that were protected under it. Keep it offline or in a restricted evidence store until your retention and investigation requirements are satisfied; do not leave it in a broadly readable container volume.
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Understand the session impact
Rotating LANGFLOW_SECRET_KEY invalidates active JWT sessions because the key signs those tokens. Users must sign in again. The default access-token lifetime is 3600 seconds (one hour), and the default refresh-token lifetime is 604800 seconds (seven days); rotation is the reliable way to invalidate tokens before those lifetimes expire.
User passwords are not changed by this operation. Langflow’s security policy states: “User passwords use bcrypt and are not affected by key rotation.” Password resets are a separate response decision if passwords may also have been exposed.
HS256 versus asymmetric signing
The documented default uses the shared LANGFLOW_SECRET_KEY with HS256 JWT signing. In an architecture using RS256 or RS512, signing and verification rely on an asymmetric key pair instead, so rotate and distribute the private and public components according to that deployment’s key-management procedure. Do not assume that changing an HS256 secret automatically changes an asymmetric signing configuration.
Rotate provider and component credentials at their sources
For every integration found during inventory, revoke or replace the credential in the system that issued it. This includes model-provider keys, database usernames and passwords, vector-store tokens, webhook signing secrets, cloud credentials, and any other token reachable by a flow.
- Disable or revoke the suspected value at the provider.
- Create a replacement with the narrowest scopes, network access, and expiration supported by that provider.
- Update the corresponding Langflow component, global variable, folder setting, or deployment secret.
- Run a controlled test flow and inspect provider audit logs for the new credential.
- Remove the old value from exported flow files, backups, notebooks, build artifacts, and logs.
Deleting a global variable only removes Langflow’s reference; it does not invalidate the provider-owned key. A provider must confirm revocation independently.
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Redeploy every consumer
After rotation, update all systems that call Langflow or are called by its flows. This commonly includes browser applications, SDK clients, command-line scripts, CI/CD jobs, scheduled workers, inbound webhooks, reverse-proxy policies, and exported flow definitions. Roll out the new values through the secret manager and restart processes that cache credentials at startup.
Use separate secrets for development, staging, and production. A clean production key should not be copied into a test environment, and a test key should never be promoted into production. For multi-instance Langflow, ensure every process points to the same external database and receives the same current secret set; otherwise requests can fail intermittently as traffic moves between instances.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Verify that the old access is gone
Verification should test both successful recovery and deliberate failure of every old credential.
- Authenticate a protected Langflow API call with each replacement database-backed key and the new environment key, as applicable.
- Send a controlled request with each revoked database key and confirm an unauthorized response.
- After restart, test the former environment key and confirm that it is rejected.
- Open a fresh browser session and confirm that users are asked to log in again after secret-key rotation.
- Run representative flows and verify that each provider accepts the replacement credential.
- Check provider, database, cloud, proxy, and Langflow logs for continued use of revoked values or unexpected source addresses.
- Confirm that webhooks, CI jobs, scheduled workers, and client applications have completed their redeployments.
Do not treat a successful Langflow login as proof that provider access is fixed. A flow can authenticate to Langflow correctly while still using an old model, database, vector-store, or webhook credential.
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| Deployment choice | Rotation concern | Operational check |
|---|---|---|
| Database-backed API-key validation | Individual keys can be deleted in the UI. | Confirm each old key returns unauthorized and issue per-client replacements. |
| Environment-backed API-key validation | One key authenticates as a superuser. | Replace LANGFLOW_API_KEY, restart, and test old-key rejection. |
| Single-user instance | A leaked administrative credential may expose the whole instance. | Review every flow, variable, integration, and local configuration. |
| Authenticated multi-user instance | Keys inherit individual creator privileges, while JWT sessions span active users. | Revoke affected keys, rotate the secret, and require fresh logins. |
| SQLite or local configuration | Files and local backups may contain the key or encrypted data. | Restrict file permissions and protect the old-key backup. |
| External database and multiple instances | Mixed versions or different secrets can cause inconsistent authentication and decryption. | Coordinate a stop, migration, and restart across the fleet. |
| Langflow-managed encrypted values | They require the secret-key migration procedure. | Run the dry-run preview before the atomic migration. |
| Provider-owned credentials | Langflow cannot revoke them for you. | Rotate them at the issuing service and verify its audit trail. |
Hardening after recovery
- Set
LANGFLOW_AUTO_LOGIN=Falsein production. - Use an explicitly generated, unique production
LANGFLOW_SECRET_KEY; never rely on a default or a value shared with another environment. - Consider setting
LANGFLOW_ENABLE_SUPERUSER_CLI=Falsewhere command-line superuser creation is not required. - Keep webhook authentication enabled and validate signatures before processing requests.
- Place Langflow behind a secure API gateway or authenticated reverse proxy instead of exposing its port directly to the internet.
- Use a secret manager with access auditing, rotation ownership, and restricted read permissions.
- Apply process-, disk-, network-, and database-level isolation outside the Langflow container for multi-tenant or third-party service deployments.
- Prefer short-lived, narrowly scoped provider credentials and separate keys by application or flow.
- Alert on failed authentication bursts, use of revoked keys, unexpected egress, and access from unfamiliar networks.
Common mistakes and their fixes
Only changing the global variable
Why it fails: The provider still considers its old key valid. Fix: revoke and replace the credential at the provider, then update Langflow.
Overwriting LANGFLOW_SECRET_KEY without migration
Why it fails: Existing encrypted values may no longer decrypt, and active JWTs are not handled through the supported atomic process. Fix: stop Langflow, run the dry-run command, apply the migration, and restart.
Rotating a database key while an environment key remains active
Why it fails: The environment-backed key is a separate authentication path with superuser scope. Fix: inventory the configured source and rotate every active path.
Restarting only one instance
Why it fails: Requests can alternate between processes using different secrets or stale environment values. Fix: coordinate the fleet and verify configuration equality before reopening traffic.
Deleting the old-key backup immediately
Why it fails: It may destroy evidence or remove the rollback material before the migration is proven. Fix: preserve it in a restricted, encrypted evidence location and follow the incident-retention decision.
When to rebuild instead of rotate
Rotation is appropriate when you can identify the trusted host, preserve a reliable configuration, and verify that the deployment has not been modified. Rebuild from a known-good image or package when you cannot account for filesystem changes, unknown administrative access, tampered startup scripts, altered dependencies, or incomplete logs. In a rebuild, restore only reviewed flow definitions and data, generate fresh secrets, and keep the isolated original for forensics rather than reconnecting it to production traffic.
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