Vulnerability · Published Jul 17, 2026 · Assigned by ibm

CVE-2026-8505Authentication Bypass in Webhook Endpoints Allowed Unauthorized Flow Execution

Critical 9.8

In plain English

A critical-severity missing authentication in Langflow OSS from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.9%top 41.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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).

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	langflow	1.9.1	GHSA-cf6m-vc3m-7cgm
PyPI	langflow	1.9.1	PYSEC-2026-4233

Affected products (as reported)

Vendor	Product	Versions
IBM	Langflow OSS	1.0.0 – through 1.10.0

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://www.ibm.com/support/pages/node/7278921 vendor-advisory, patch