IBM Langflow OSS up to 1.10.0 Webhook Authentication UUID improper authentication

Summaryinfo

A vulnerability, which was classified as critical, has been found in IBM Langflow OSS up to 1.10.0. This affects an unknown function of the component Webhook Authentication. The manipulation of the argument UUID leads to improper authentication. This vulnerability is listed as CVE-2026-8505. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in IBM Langflow OSS up to 1.10.0 and classified as critical. This issue affects an unknown functionality of the component Webhook Authentication. The manipulation of the argument UUID with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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).

It is possible to read the advisory at ibm.com. The identification of this vulnerability is CVE-2026-8505 since 05/14/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/18/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-45272). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• IBM

Name

• Langflow OSS

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10.0

License

• commercial

Website

• Vendor: https://www.ibm.com/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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