NVD / CVE Program· CNA VulnCheck

CVE-2026-56274: Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess

Noroxi assessment

Priority: Plan (action score 40/100)

A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
Because a ready-made attack tool exists, priority is at least “Plan”.
Probability of exploitation in the next 30 days: 7.5% (FIRST EPSS); higher than 94.4% of all records.
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Flowise Flowise 3.1.2; Flowise Flowise Components 3.1.2.

Add it to your regular patch cycle. Upgrade to Flowise Flowise 3.1.2; Flowise Flowise Components 3.1.2 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

Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.

HighCVSS 8.7 · v4.0—Weaponized Fix available

GHSA-m99r-2hxc-cp3q

Published: Jun 23, 2026
Updated: Jun 25, 2026
EPSS: 7.5% · 94th percentile
CWE: CWE-78

Report tools

JSON

Action score

Plan

Add it to your regular patch cycle.

CVSS: 34 / 40 · 8.7 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 2 / 30 · 7.5%
Ready-made attack tool: 4 / 40 · floor: at least 40

CISA SSVC decision

Exploitation: proof of concept
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · VulnCheck: 8.7; NVD has not scored this yet; the score shown is the CNA’s.

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

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

Get told when this record changes

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 3.1.2

Versions reported by the vendor

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

Flowise Flowise
- 3.1.2not affected
- before 3.1.2affected · semver
Flowise Flowise Components
- 3.1.2not affected
- before 3.1.2affected · 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	before 3.1.2	3.1.2
npm	flowise-components	before 3.1.2	3.1.2

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-2025-58434Flowise Cloud and Local Deployments have Unauthenticated Password Reset Token Disclosure that Leads to Account Takeover
62This week
CVE-2025-8943Unsupervised OS command execution leads to remote code execution by unauthenticated network attackers
62This week

Published before and after this one in the same product

← EarlierCVE-2026-12821Jun 22, 2026 · FlowiseAI Flowise S3 Document Loader S3.ts path traversal
8Monitor
← EarlierCVE-2026-56268Jun 22, 2026 · Flowise - Cross-Workspace Information Disclosure via chatflows/apikey Endpoint
21Monitor
Later →CVE-2025-71337Jun 23, 2026 · Flowise - Unverified Email Change via Account Profile Endpoint
34Monitor

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
Flowise Flowise	3.1.2	Vendor (CNA)
Flowise Flowise Components	3.1.2	Vendor (CNA)
npm:flowise	3.1.2	Package registry (OSV)
npm:flowise-components	3.1.2	Package registry (OSV)

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

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_mcp_rceFlowise MCP Server Remote Code Executionexploit	2026-06-23

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.

MetasploitJun 23, 2026same day
PublishedJun 23, 2026
TodayOct 31, 2026+130 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.

cn-pandareporter

Variant candidates

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

CVE-2026-4093363 days apartFlowise: Authenticated RCE Via MCP Adapters
43Plan
CVE-2025-713362 days apartFlowise - Unsandboxed Remote Code Execution via Custom MCP
37Monitor
CVE-2026-7348351 days apartFlowise before 3.1.3 Sandbox Escape via Puppeteer
37Monitor
CVE-2026-9193184 days apartFlowise before 3.1.4 Remote Code Execution via Custom MCP npx
36Monitor
CVE-2026-9193684 days apartFlowise before 3.1.4 Script Injection via Docker Workflows
33Monitor

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-2025-713362 days apartFlowise - Unsandboxed Remote Code Execution via Custom MCP
37Monitor
CVE-2025-713272 days apartFlowise - Authentication Bypass via Unprotected Registration Endpoint
37Monitor
CVE-2026-562787 days apartFlowise - Session Hijacking via Weak Default Express Session Secret
37Monitor
CVE-2026-5627119 days apartFlowise - Weak Default JWT Secrets in Authentication Middleware
37Monitor

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.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: X

Weakness class (CWE)

CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS vector

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

nvd-secondary

Root cause

User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.

The bug in code

The whole CWE-78 class

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

Vulnerable

1const host = req.body.host;
2exec("ping -c 1 " + host, onResult);

Fixed

1const host = req.body.host;
2if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);
3execFile("ping", ["-c", "1", host], onResult);

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, 10:10 PM UTC

For records you follow, these changes also arrive as notifications. →

References

www.vulncheck.com/advisories/flowise-remote-code-execution-via-mcp-security-bypass-in-validatecommandflags-and-validateargsforlocalfileaccess

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

We use this product, ask for help

Data sources and verification

CNA: VulnCheck

CVE.org (CNA)Jun 24, 2026, 11:17 AM UTC
CISA ADPJun 24, 2026, 11:17 AM UTC
NVDJun 25, 2026, 2:39 PM UTC
FIRST EPSSOct 29, 2026, 12:00 AM UTC
OSV / GHSAOct 30, 2026, 3:18 AM UTC
MetasploitOct 30, 2026, 3:18 AM UTC

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