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 products
flowiseai: flowise
References5
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-6vh2-wg4h… ExploitVendor Advisory
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-6vh2-wg4h… ExploitVendor Advisory
- github.com/FlowiseAI/Flowise/commit/23b997ee5ef9e269b628bad0f56… Patch
- github.com/FlowiseAI/Flowise/pull/6279 Issue TrackingPatch
- github.com/FlowiseAI/Flowise/releases/tag/[email protected] PatchRelease Notes
Metrics
- CVSS 3.1
-
9.1
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 4.0
-
8.8
HIGH
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 52 · as of 13 November 2026
- CWE
- CWE-639CWE-915
Could this be exploited in your environment?
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