IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to execute arbitrary code due to improper input validation.
**Risk verdict:** Expedite remediation: the attack is remotely reachable with limited access and could compromise the service’s confidentiality, integrity and availability; active exploitation status is unknown.
**Why this matters:** Successful access could let an attacker alter workflows, expose data available to the service, or disrupt its operation. The practical impact depends on what integrations, credentials and data the deployment can reach. KEV, SSVC, PoC and EPSS indicators were not provided, so exploitation likelihood cannot be assessed from those signals.
**Most likely attack path:** An attacker needs network access to the service and a low-privilege authenticated account; no user interaction or unusual conditions are required. The stated scope is unchanged, so cross-boundary impact is not indicated, though reachable integrations and service credentials could enable further access.
**Who is most exposed:** Prioritise internet-accessible or broadly reachable self-hosted workflow-building deployments, especially those connected to sensitive systems or holding powerful integration credentials.
Review authentication and application audit logs for unusual workflow or component changes.
Alert on unexpected child processes launched by the service.
Check outbound connections and integration use for anomalous destinations or volume.
Investigate new accounts, privilege changes and access from unfamiliar sources.
Mitigation and prioritisation:
Upgrade promptly to the vendor-fixed release; verify deployment and dependency versions.
Restrict network access and disable public exposure where not required.
Rotate exposed credentials and limit the service’s permissions and reachable integrations.
Test the upgrade in staging, then deploy through change control; monitor closely afterwards.
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