CVE-2025-56647Public exploitNetwork attack vector

Source code disclosure via unchecked WebSocket origin

Published Feb 12, 2026 · Updated Feb 12, 2026

Information disclosure in Farm @farmfe/core before 1.7.6 allows remote attackers to read source code through the HMR WebSocket. WsServer.isHMRRequest accepts upgrades based only on the /__hmr path and farm_hmr subprotocol, without comparing the Origin header to the configured host and port. Exploitation requires a developer to run the development server, visit an attacker-controlled webpage, and then modify code; the page can connect to localhost:9000 and receive HMR messages containing that code.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Farm @farmfe/core before 1.7.6 allows remote attackers to read source code through the HMR WebSocket. WsServer.isHMRRequest accepts upgrades based only on the /__hmr path and farm_hmr subprotocol, without comparing the Origin header to the configured host and port. Exploitation requires a developer to run the development server, visit an attacker-controlled webpage, and then modify code; the page can connect to localhost:9000 and receive HMR messages containing that code.

The record

CVE
CVE-2025-56647
Published
Feb 12, 2026
Updated
Feb 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1385
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1385Missing Origin Validation in WebSockets

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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