Vulnerability · Published Aug 4, 2026 · Assigned by GitHub_M
CVE-2026-69258Flowise: Unauthenticated Property Injection into Flow Execution Context via Ungated `overrideConfig` Spread in Prediction API
High 8.8
In plain English
A high-severity authorization bypass via user-controlled key in Flowise from FlowiseAI. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | flowise | 3.1.3 | GHSA-6vh2-wg4h-4vwj |
Affected products (as reported)
Weakness: CWE-639, CWE-915 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6vh2-wg4h-4vwj x_refsource_CONFIRM
- https://github.com/FlowiseAI/Flowise/pull/6279 x_refsource_MISC
- https://github.com/FlowiseAI/Flowise/commit/23b997ee5ef9e269b628bad0f56f1ecb86bd2fca x_refsource_MISC
- https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 x_refsource_MISC