# CVE-2025-56647: @farmfe/core — Fixed in 1.7.6

📦

📦 npm

Not in CISA KEV

MEDIUM severity

# CVE-2025-56647 — @farmfe/core

MEDIUM [Fix: farm-fe/farm@83342ef](https://github.com/farm-fe/farm/commit/83342ef06e0aea37270950fd8c930422c4df0679)

CVE-2025-56647 is a medium-severity (CVSS 6.5) CWE-1385 vulnerability in @farmfe/core. A fix is available for @farmfe/core — see the affected versions and patch details below.

@farmfe/core is Missing Origin Validation in WebSocket

Also known as[GHSA-p773-8mf4-rjm5](/vulnerability/GHSA-p773-8mf4-rjm5)

Published

Feb 12, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

## Exploitation Status

### Proof-of-concept exploit code exists

-   CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-56647.

## EPSS Exploitation Probability

[via FIRST.org ↗](https://www.first.org/epss/)

0.2%probability of exploitation in next 30 days

Lower Risk\-0.00%

Lower risk than most CVEs12th percentile — riskier than 12% of all scored CVEsHighest risk

0.00%0.24%0.48%0.72%0.0%0.2%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from [FIRST.org EPSS](https://www.first.org/epss/).

## How urgent is this, really

## Where this sits among everything scored

## Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

5other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

`@farmfe/core`npm

11Kdownloads / week

## Description

npm @farmfe/core before 1.7.6 is Missing Origin Validation in WebSocket. The development (hot module reloading) server does not validate origin when connecting to a WebSocket client. This allows attackers to surveil developers running Farm who visit their webpage and steal source code that is leaked by the WebSocket server.

## Affected Packages

1 total 1 fixed

Ecosystem

Package

Vulnerable range

Fix

📦npm

`@farmfe/core` 

all versions

1.7.6`npm install @farmfe/core@1.7.6`

## Detection & mitigation playbook

Open-source dependency

1.  ### Detect
    
    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @farmfe/core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
    
2.  ### Fix
    
    Update @farmfe/core to 1.7.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-56647 is resolved across your whole dependency graph.
    
3.  ### Workarounds
    
    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
    

## Frequently Asked Questions

npm @farmfe/core before 1.7.6 is Missing Origin Validation in WebSocket. The development (hot module reloading) server does not validate origin when connecting to a WebSocket client. This allows attackers to surveil developers running Farm who visit their webpage and steal source code that is leaked by the WebSocket server.

O3 Security · Impact-Aware SCA

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Find it across npm, including transitive dependencies.

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