CVE-2026-34046
March 27, 2026
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the "_read_flow" helper in "src/backend/base/langflow/api/v1/flows.py" branched on the "AUTO_LOGIN" setting to decide whether to filter by "user_id". When "AUTO_LOGIN" was "False" (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other user's flow, including embedded plaintext API keys; modify the logic of another user's AI agents, and/or delete flows belonging to other users. The vulnerability was introduced by the conditional logic that was meant to accommodate public/example flows (those with "user_id = NULL") under auto-login mode, but inadvertently left the authenticated path without an ownership filter. The fix in version 1.5.1 removes the "AUTO_LOGIN" conditional entirely and unconditionally scopes the query to the requesting user.
Affected Packages
https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=aka-1.7.0 <1.5.1Fix Suggestion:
Update to version 1.5.1https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=aka-1.7.0 <1.5.1Fix Suggestion:
Update to version 1.5.1https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=aka-1.7.0 <1.5.1Fix Suggestion:
Update to version 1.5.1https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=aka-1.7.0 <1.5.1Fix Suggestion:
Update to version 1.5.1https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=aka-1.7.0 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow-base (PYTHON):
Affected version(s) >=0.0.1 <0.5.1Fix Suggestion:
Update to version 0.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow-base (PYTHON):
Affected version(s) >=0.0.1 <0.5.1Fix Suggestion:
Update to version 0.5.1langflow-base (PYTHON):
Affected version(s) >=0.0.1 <0.5.1Fix Suggestion:
Update to version 0.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow-base (PYTHON):
Affected version(s) >=0.0.1 <0.5.1Fix Suggestion:
Update to version 0.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1langflow-base (PYTHON):
Affected version(s) >=0.0.1 <0.5.1Fix Suggestion:
Update to version 0.5.1langflow (PYTHON):
Affected version(s) >=0.0.31 <1.5.1Fix Suggestion:
Update to version 1.5.1Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.08
