CVE-2026-8505

Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution

Published Jul 17, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
IBM Langflow OSS 1.0.0 through 1.10.0 has a vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOK_AUTH_ENABLE configuration is set to False (which is the default setting). This allows a remote attacker who knows a flow's UUID to execute it as if they were the owner, potentially leading to Remote Code Execution (RCE).

Remediation

Vendor Solution

IBM strongly recommends addressing the vulnerability now by upgrading Langflow OSS to version 1.10.1 https://pypi.org/project/langflow/

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-cf6m-vc3m-7cgm Langflow: Unauthenticated Flow Execution via Webhook Authentication Bypass
History
Type Values Removed Values Added
Weaknesses CWE-284
CWE-287
Type Values Removed Values Added
Weaknesses CWE-284
CWE-287
Type Values Removed Values Added
Weaknesses CWE-306
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description IBM Langflow OSS 1.0.0 through 1.10.0 has a vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOK_AUTH_ENABLE configuration is set to False (which is the default setting). This allows a remote attacker who knows a flow's UUID to execute it as if they were the owner, potentially leading to Remote Code Execution (RCE).
Title Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution
First Time appeared Ibm
Ibm langflow Oss
CPEs cpe:2.3:a:ibm:langflow_oss:1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:ibm:langflow_oss:1.10.0:*:*:*:*:*:*:*
Vendors & Products Ibm
Ibm langflow Oss
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
ibm
Published
Updated
Jul 23, 2026, 3:56 AM
Reserved
May 13, 2026, 10:04 PM
Status
Modified
Published
Jul 17, 2026, 8:17 PM
Modified
Oct 24, 2026, 8:10 PM