NVD / CVE Program· CNA JFROG

CVE-2025-8943: Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers

Noroxi assessment

Priority: This week (action score 62/100)

A ready-made attack module is public (Metasploit, Nuclei); exploiting it takes no special expertise.
Probability of exploitation in the next 30 days: 75.2% (FIRST EPSS); higher than 99.5% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: www.npmjs.com flowise 3.0.1.

Don’t wait for the next maintenance window. Upgrade to www.npmjs.com flowise 3.0.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However, Flowise's inherent authentication and authorization model is minimal and lacks role-based access controls (RBAC). Furthermore, in Flowise versions before 3.0.1 the default installation operates without authentication unless explicitly configured. This combination allows unauthenticated network attackers to execute unsandboxed OS commands.

CriticalCVSS 9.8 · v3.1—Weaponized Fix available

Published: Aug 14, 2025
Updated: Jun 17, 2026
EPSS: 75.2% · 99th percentile
CWE: CWE-306

Report tools

JSON

Action score

This week

Don’t wait for the next maintenance window.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 23 / 30 · 75.2%

CISA SSVC decision

Exploitation: proof of concept
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · JFROG: 9.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Not in KEV: no record of exploitation in the wild
Weaponized exploit exists
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
flowiseai	flowise	cpe:2.3:a:flowiseai:flowise

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

flowiseai flowisebefore 3.0.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (JFROG). Independent of NVD's CPE analysis and usually ahead of it.

www.npmjs.com flowise
- before 3.0.1affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
npm	flowise	up to and including 3.0.5	—

Same product

flowiseai: all records

Other highest-scoring records for the same primary product.

CVE-2025-59528Flowise has Remote Code Execution vulnerability
66This week
CVE-2026-41264Flowise: CSV Agent Prompt Injection Remote Code Execution Vulnerability
60This week
CVE-2025-26319FlowiseAI Flowise v2.2.6 was discovered to contain an arbitrary file upload vulnerability in /api/v1/attachments.
56Plan

Published before and after this one in the same product

← EarlierCVE-2024-8182Aug 27, 2024 · Flowise Denial of Service
34Monitor
← EarlierCVE-2025-29189Apr 9, 2025 · Flowise <= 2.2.3 is vulnerable to SQL Injection.
30Monitor
Later →CVE-2025-58434Sep 12, 2025 · Flowise Cloud and Local Deployments have Unauthenticated Password Reset Token Disclosure that Leads to Account Takeover
54Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
www.npmjs.com flowise	3.0.1	Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

Metasploit module ×1
Nuclei detection template ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Metasploit module	exploit/multi/http/flowise_custommcp_rceFlowise Custom MCP Remote Code Executionexploit	2025-08-14
Nuclei detection template	Nuclei template CVE-2025-8943	—

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

MetasploitAug 14, 2025same day
PublishedAug 14, 2025
TodayOct 27, 2026+439 d

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2025-5843429 days apartFlowise Cloud and Local Deployments have Unauthenticated Password Reset Token Disclosure that Leads to Account Takeover
54Plan
CVE-2026-30824205 days apartFlowise: Missing Authentication on NVIDIA NIM Endpoints
41Plan
CVE-2025-71327315 days apartFlowise - Authentication Bypass via Unprotected Registration Endpoint
37Monitor
CVE-2026-56270314 days apartFlowise - Unauthenticated OAuth Secrets Disclosure via /api/v1/loginmethod Endpoint
35Monitor
CVE-2026-41273252 days apartFlowise: Unauthenticated OAuth 2.0 Access Token Disclosure via Public Chatflow
30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2025-6191355 days apartFlowise is vulnerable to arbitrary file read, arbitrary file write
43Plan
CVE-2025-6168753 days apartFlowiseAI/Flosise has File Upload vulnerability
39Monitor
CVE-2025-3426761 days apartFlowise Authenticated Command Execution and Sandbox Bypass via Puppeteer & Playwright Packages
35Monitor
CVE-2025-29189127 days apartFlowise <= 2.2.3 is vulnerable to SQL Injection.
30Monitor

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1// Added for the support team
2app.post("/maintenance/reset", resetDevice);

Fixed

1if (config.maintenanceEnabled) {
2  app.post(
3    "/maintenance/reset",
4    requireSession, requireRole("admin"), resetDevice
5  );
6}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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All records

Noroxi analysis

What does it mean in your environment?

We use this product, ask for help

Data sources and verification

CNA: JFROG

CVE.org (CNA)Aug 18, 2025, 4:47 PM UTC
CISA ADPAug 18, 2025, 4:47 PM UTC
NVDJun 17, 2026, 6:07 AM UTC
FIRST EPSSOct 26, 2026, 12:00 AM UTC
OSV / GHSAOct 27, 2026, 3:18 AM UTC
MetasploitOct 27, 2026, 3:17 AM UTC
NucleiOct 27, 2026, 3:18 AM UTC

Each line is when that source was last processed for this record.