Is CVE-2025-8943 actively exploited?

Yes. KEV Intelligence has observed exploitation attempts targeting this CVE. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence sensors have observed 53 exploitation attempts, 26 unique attacker IPs, and 12 countries targeting CVE-2025-8943. First observed Jul 10, 2026; last observed Aug 18, 2026.

Which versions are affected?

CVE-2025-8943 affects Flowise Flowise. Reported affected version: 0 to < 3.0.1.

How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

No. CVE-2025-8943 is not currently listed in CISA KEV.

CVE-2025-8943 Exploitation Observed — Flowise

Q: How should organizations remediate it?

Prioritize immediate patching and validate internet-facing exposure. Monitor for matching exploitation attempts in your environment.

Q: Is it in CISA KEV?

No. CVE-2025-8943 is not currently listed in CISA KEV.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-8943 is an unauthenticated vulnerability affecting Flowise Flowise. The Custom MCPs feature is designed to execute OS commands, for instance, using tools like `npx` to spin up local MCP Servers. However,...

Is it exploited?

Yes. KEV Intelligence sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Flowise / Flowise affected before 3.0.1.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Flowise Remote Code Execution

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.

Vendor Product Affected Status

— — flowise Before 3.0.1 Affected

View vendor advisory

Published: 14 Aug 2025
Exploitation Reported: 10 Jul 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-8943
Third-Party Advisory — research.jfrog.com research.jfrog.com · Third-Party Advisory https://research.jfrog.com/vulnerabilities/flowise-os-command-remote-...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

KEV Intelligence

Recorded 10 Jul 2026

Independent exploitation attestation added to the KEV Intelligence record.

Active exploitation observed

KEV Intelligence sensor

First observed 10 Jul 2026

First-party sensor telemetry confirms matching exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.

Learn about Pro API access

Source	Added
KEV Intelligence First	2026-08-05 08:45 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

53

Attempts observed

26

Unique attacker IPs

12

Attacker countries

BN · CN · GB · HK · IL · IN · IR · JP · NL · SG · US · VN

5

Sensors observed

Exploitation attempts over the last 42 days

Daily events observed by KEV Intelligence sensors

Updated 19 Aug 2026

0

2

3

0

12

3

2

0

2

1

3

9

0

3

0

2

3

0

1

0

1

2

1

2

5

6

1

2

6

2

0

9 Jul 18 Jul 27 Jul 5 Aug 19 Aug

First observed 10 Jul 2026 · Last observed 18 Aug 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

Request telemetry access

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 1
User-Agents: 28

Raw values available in Pro and Enterprise.

Scanner coverage

Nuclei template detected 01 Jun 2026.

View Nuclei template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Nuclei	https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8943.yaml	01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.8 Critical

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

EPSS

72.3%

Weaknesses

Missing Authentication for Critical Function CWE-306 Missing Authorization CWE-862

Recent mention · Github Advisory Database (NPM)

[flowise-components] Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

Summary The mitigation shipped for CVE-2025-8943 blocks the -y and --yes flags on npx to stop auto-installation of arbitrary packages. That flag filter works. The environment-variable check in the same patch denies only four variable names by exact string match, and npm reads...

Read full advisory

All Mentions

Recent mention · Github Advisory Database (NPM)

[flowise-components] Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

Github Advisory Database (NPM) · 04 Aug 2026

Summary The mitigation shipped for CVE-2025-8943 blocks the -y and --yes flags on npx to stop auto-installation of arbitrary packages. That flag filter works. The environment-variable check in the same patch denies only four variable names by exact string match, and npm reads its configuration directly from npm_config_* environment variables. Setting npm_config_yes=true reproduces the --yes behaviour the flag filter is meant to prevent, so npx auto-installs and executes the named package. The mitigation is fully bypassed. This works with the MCP security check enabled...

Recent mention · Github Advisory Database (NPM)

[flowise] Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

Github Advisory Database (NPM) · 04 Aug 2026

Summary The mitigation shipped for CVE-2025-8943 blocks the -y and --yes flags on npx to stop auto-installation of arbitrary packages. That flag filter works. The environment-variable check in the same patch denies only four variable names by exact string match, and npm reads its configuration directly from npm_config_* environment variables. Setting npm_config_yes=true reproduces the --yes behaviour the flag filter is meant to prevent, so npx auto-installs and executes the named package. The mitigation is fully bypassed. This works with the MCP security check enabled...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Flowise < 3.0.1 - Remote Command Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

10 Jul 2026
Observed by KEV Intelligence sensors

Evidence-backed exploitation signal
10 Jul 2026
Indicators of compromise added (40)

Indicators of compromise recorded
12 Jun 2026
Public PoC available

Public proof-of-concept code published
01 Jun 2026
Nuclei template available

Scanner coverage available
14 Aug 2025
CVE published

Vulnerability disclosed publicly
13 Aug 2025
CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-8943

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2025-8943",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.7231,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 53, "sensors": 5 }
}

CVE-2025-8943

What security teams need to know first

Flowise Remote Code Execution

Tags

CVE References

Why KEV Intelligence marks this CVE as exploited

Exploited in the wild

Active exploitation observed

Known exploited vulnerability sources

First-party evidence of exploitation activity

Operational artifacts and observed signals

Observed signals

Scanner coverage

Virtual patch status

Attacker IP Indicators

Scanner Artifacts

Severity, weaknesses, and research context

Weaknesses

[flowise-components] Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

All Mentions

Potential Proof of Concepts

From disclosure to observed exploitation

Observed by KEV Intelligence sensors

Indicators of compromise added (40)

Public PoC available

Nuclei template available

CVE published

CVE ID reserved

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