Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)
Published Aug 4, 2026
8.7
HIGHCVSS 4.0
EPSS 0.66%
Description
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the mitigation for CVE-2025-8943 blocked -y and --yes flags on npx, but packages/components/nodes/tools/MCP/core.ts denied only PATH, LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, and NODE_OPTIONS by exact environment-variable name. Because npm reads configuration from npm_config_* variables, setting npm_config_yes=true reproduced --yes behavior without using a blocked flag, causing npx to auto-install and execute the named package when a Custom MCP server launched. This issue is fixed in version 3.1.3.
Affected products
-
- Version < 3.1.3StatusaffectedConstraints-
- Version
No data.
No Red Hat product state for this CVE.
flowise
npm
Introduced 0 Fixed 3.1.3flowise-components
npm
Introduced 0 Fixed 3.1.3
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | flowise | 0 | 3.1.3 |
| npm | flowise-components | 0 | 3.1.3 |
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Aug 4, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.66% (0.00662) | 49.91th | v5 (v2026.06.15) |
| Aug 5, 2026 | 0.27% (0.00268) | 18.74th | v5 (v2026.06.15) |
References (5)
- https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351 x_refsource_MISCPatch
- https://github.com/FlowiseAI/Flowise/pull/6471 x_refsource_MISCIssue TrackingPatch
- https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 x_refsource_MISCPatchRelease Notes
- https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw exploitx_refsource_CONFIRMVendor Advisory
- https://github.com/advisories/GHSA-xc48-889x-5qmw Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351 | x_refsource_MISCPatch | |
| https://github.com/FlowiseAI/Flowise/pull/6471 | x_refsource_MISCIssue TrackingPatch | |
| https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 | x_refsource_MISCPatchRelease Notes | |
| https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw | exploitx_refsource_CONFIRMVendor Advisory | |
| https://github.com/advisories/GHSA-xc48-889x-5qmw | Advisory |
Change history (0)
No recorded changes yet.