FlowiseAI Flowise up to 3.1.2 Prediction Endpoint index.ts overrideConfig injection

Summaryinfo

A vulnerability was found in FlowiseAI Flowise up to 3.1.2. It has been rated as critical. This impacts an unknown function of the file packages/server/src/utils/buildChatflow.ts/packages/server/src/utils/index.ts of the component Prediction Endpoint. The manipulation of the argument overrideConfig leads to injection. This vulnerability is traded as CVE-2026-69258. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in FlowiseAI Flowise up to 3.1.2 and classified as critical. This issue affects an unknown function of the file packages/server/src/utils/buildChatflow.ts/packages/server/src/utils/index.ts of the component Prediction Endpoint. The manipulation of the argument overrideConfig with an unknown input leads to a injection vulnerability. Using CWE to declare the problem leads to CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the unauthenticated POST /api/v1/prediction/:id endpoint accepted an overrideConfig object and unconditionally spread it into internal flowConfig and flowData objects in packages/server/src/utils/buildChatflow.ts and packages/server/src/utils/index.ts without checking apiOverrideStatus. This allowed unauthenticated attackers to inject arbitrary properties into the flow execution context of any public chatflow, overwrite values such as chatId, sessionId, and chatHistory, and control values resolved through $flow.* template variables consumed by flow nodes. This issue is fixed in version 3.1.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-69258 since 08/03/2026. 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. MITRE ATT&CK project uses the attack technique T1055 for this issue.

Upgrading to version 3.1.3 eliminates this vulnerability.

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Productinfo

Vendor

• FlowiseAI

Name

• Flowise

Version

• 3.1.0
• 3.1.1
• 3.1.2

Website

• Product: https://github.com/FlowiseAI/Flowise/

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

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