IBM Langflow OSS up to 1.10.3 MemoryComponent session_id authorization

Summaryinfo

A vulnerability classified as problematic was found in IBM Langflow OSS up to 1.10.3. Impacted is the function MemoryComponent.retrieve_messages/ MemoryComponent.store_message of the component MemoryComponent. The manipulation of the argument session_id results in authorization. This vulnerability was named CVE-2026-9130. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in IBM Langflow OSS up to 1.10.3. It has been classified as problematic. Affected is the function MemoryComponent.retrieve_messages/ MemoryComponent.store_message of the component MemoryComponent. The manipulation of the argument session_id with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality. CVE summarizes:

IBM Langflow OSS 1.0.0 through 1.10.3 contain an authorization bypass vulnerability in the MemoryComponent that allows authenticated users to access chat history of other users via session_id collision. The MemoryComponent.retrieve_messages and store_message methods filter on session_id without validating flow_id or user_id ownership, enabling cross-user information disclosure through multiple authenticated API endpoints including /api/v1/run/*, /api/v1/responses, and /api/v2/workflow/*. This vulnerability only affects multi-user deployments with LANGFLOW_AUTO_LOGIN=False.

The advisory is available at ibm.com. This vulnerability is traded as CVE-2026-9130 since 05/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/05/2026).

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

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Productinfo

Vendor

• IBM

Name

• Langflow OSS

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3

License

• commercial

Website

• Vendor: https://www.ibm.com/

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