CVE-2026-69258: CWE-639: Authorization Bypass Through User-Controlled Key in FlowiseAI Flowise
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.
AI Analysis
Technical Summary
CVE-2026-69258 is an authorization bypass vulnerability in Flowise before version 3.1.3. The unauthenticated POST /api/v1/prediction/:id endpoint accepts an overrideConfig object and unconditionally merges it into internal flowConfig and flowData objects without verifying apiOverrideStatus. This enables unauthenticated attackers to manipulate the flow execution context of any public chatflow by injecting arbitrary properties, including overwriting chatId, sessionId, and chatHistory, and controlling values resolved through $flow.* template variables used by flow nodes. The vulnerability is fixed in Flowise version 3.1.3.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to bypass authorization controls and inject arbitrary properties into the flow execution context of public chatflows. This can lead to manipulation of session identifiers and chat history, potentially affecting the integrity and confidentiality of chat interactions processed by the system. The CVSS 4.0 score of 8.8 indicates a high severity impact with network attack vector, no privileges required, no user interaction, and high impact on integrity and availability.
Mitigation Recommendations
Upgrade Flowise to version 3.1.3 or later, where this vulnerability is fixed. No other mitigation is indicated or necessary as the issue is resolved in the official patch.
CVE-2026-69258: CWE-639: Authorization Bypass Through User-Controlled Key in FlowiseAI Flowise
Description
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.
CVSS v4.0
Score 8.8high
Affected software
FlowiseAI
Flowise
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-69258 is an authorization bypass vulnerability in Flowise before version 3.1.3. The unauthenticated POST /api/v1/prediction/:id endpoint accepts an overrideConfig object and unconditionally merges it into internal flowConfig and flowData objects without verifying apiOverrideStatus. This enables unauthenticated attackers to manipulate the flow execution context of any public chatflow by injecting arbitrary properties, including overwriting chatId, sessionId, and chatHistory, and controlling values resolved through $flow.* template variables used by flow nodes. The vulnerability is fixed in Flowise version 3.1.3.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to bypass authorization controls and inject arbitrary properties into the flow execution context of public chatflows. This can lead to manipulation of session identifiers and chat history, potentially affecting the integrity and confidentiality of chat interactions processed by the system. The CVSS 4.0 score of 8.8 indicates a high severity impact with network attack vector, no privileges required, no user interaction, and high impact on integrity and availability.
Mitigation Recommendations
Upgrade Flowise to version 3.1.3 or later, where this vulnerability is fixed. No other mitigation is indicated or necessary as the issue is resolved in the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-03T19:54:19.853Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a721342bf8831d5391ad5e4
Added to database: 08/04/2026, 16:28:50 UTC
Last enriched: 08/11/2026, 17:52:11 UTC
Last updated: 09/18/2026, 22:01:37 UTC
Views: 65
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