IBM Langflow OSS up to 1.10.0 Auto Login Endpoint /api/v1/login/auto_login improper authentication

Summaryinfo

A vulnerability identified as critical has been detected in IBM Langflow OSS up to 1.10.0. The affected element is the function auto_login of the file /api/v1/login/auto_login of the component Auto Login Endpoint. The manipulation leads to improper authentication. This vulnerability is listed as CVE-2026-9103. 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 the function auto_login of the file /api/v1/login/auto_login of the component Auto Login Endpoint. The manipulation 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 could allow a remote attacker to gain unauthorized access due to improper authentication in the /api/v1/login/auto_login endpoint. The endpoint issues long-lived superuser bearer tokens without requiring authentication when the AUTO_LOGIN configuration is enabled (enabled by default), which may allow an unauthenticated network attacker to obtain full administrative access. Additionally, permissive cross-origin resource sharing (CORS) settings may allow tokens to be exposed to unintended origins, increasing the risk of unauthorized access.

The advisory is shared at ibm.com. The identification of this vulnerability is CVE-2026-9103 since 05/20/2026. 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 are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/17/2026).

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

Several companies clearly confirm that VulDB is the primary source for best 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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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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