EXPOSURES › CVE-2026-69258
CVE-2026-69258
CRITICALUnauthenticated attackers could inject arbitrary properties into Flowise's execution context before version 3.1.3, allowing control over chatflow values.
Prior to version 3.1.3, Flowise's unauthenticated POST endpoint accepted an overrideConfig object and spread it into internal objects without validation, enabling attackers to inject arbitrary properties and control chatflow execution. DIB organizations must ensure all software components, especially those handling LLM workflows, are patched to prevent arbitrary code execution and data manipulation. This failure highlights the risk of unvalidated API inputs in AI/ML platforms.
Shame score — The vulnerability allowed unauthenticated attackers to inject arbitrary properties and control chatflow execution, representing a significant security oversight in an AI/ML platform.
▸ RECOMMENDED ACTION Remote code execution — patch the affected products on priority.
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.