Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

SummaryBefore Langflow 1.10.1, two deprecated but still-routed endpoints in the chat API did not check that the authenticated caller owns the flow referenced in the URL path:- POST /api/v1/build/flowid/vertices retrieveverticesorder- POST /api/v1/build/flowid/vertices/vertexid buildvertexAny...

PYSEC-2026-4238 Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Summary Before Langflow 1.10.1, two deprecated but still-routed endpoints in the chat API did not check that the authenticated caller owns the flow referenced in the URL path: - POST /api/v1/build/flowid/vertices retrieveverticesorder - POST /api/v1/build/flowid/vertices/vertexid buildvertex Any...

PYSEC-2026-4234 Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Summary Before Langflow 1.10.1, two deprecated but still-routed endpoints in the chat API did not check that the authenticated caller owns the flow referenced in the URL path: - POST /api/v1/build/flowid/vertices retrieveverticesorder - POST /api/v1/build/flowid/vertices/vertexid buildvertex Any...

GHSA-GH98-4PHW-6FMW Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Summary Before Langflow 1.10.1, two deprecated but still-routed endpoints in the chat API did not check that the authenticated caller owns the flow referenced in the URL path: - POST /api/v1/build/flowid/vertices retrieveverticesorder - POST /api/v1/build/flowid/vertices/vertexid buildvertex Any...

Langflow : Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Summary Before Langflow 1.10.1, two deprecated but still-routed endpoints in the chat API did not check that the authenticated caller owns the flow referenced in the URL path: - POST /api/v1/build/flowid/vertices retrieveverticesorder - POST /api/v1/build/flowid/vertices/vertexid buildvertex Any...

CVE-2026-105698 Langflow: Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.0.0 until 1.10.1, Langflow did not verify flow ownership in the deprecated POST /api/v1/build/flowid/vertices and POST /api/v1/build/flowid/vertices/vertexid handlers. Through version 1.7.1, an unauthenticated...

CVE-2026-105698 Langflow: Cross-user flow access and vertex execution via deprecated /api/v1/build/{flow_id}/vertices endpoints

Langflow is a tool for building and deploying AI-powered agents and workflows. From 1.0.0 until 1.10.1, Langflow did not verify flow ownership in the deprecated POST /api/v1/build/flowid/vertices and POST /api/v1/build/flowid/vertices/vertexid handlers. Through version 1.7.1, an unauthenticated...

CVE-2026-105698

Langflow (versions 1.0.0 through 1.10.0) is vulnerable to cross-user flow access and unauthorized vertex execution due to a missing ownership check in deprecated handlers. Specifically, the POST /api/v1/build/{flow_id}/vertices and POST /api/v1/build/{flow_id}/vertices/{vertex_id} endpoints faile...

PYSEC-2026-2570 Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check

Vulnerability IDOR in GET/PATCH/DELETE /api/v1/flow/flowid The readflow helper in src/backend/base/langflow/api/v1/flows.py branched on the AUTOLOGIN setting to decide whether to filter by userid. When AUTOLOGIN was False i.e., authentication was enabled, neither branch enforced an ownership chec...

CVE-2026-55255

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.1, an Insecure Direct Object Reference IDOR vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in...