CVE-2026-27600

Received Received - Intake

Behavioral Side-Channel in HomeBox Notifier Enables Internal Enumeration

Publication date: 2026-03-03

Last updated on: 2026-03-05

Assigner: GitHub, Inc.

Description

HomeBox is a home inventory and organization system. Prior to 0.24.0-rc.1, the notifier functionality allows authenticated users to specify arbitrary URLs to which the application sends HTTP POST requests. No validation or restriction is applied to the supplied host, IP address, or port. Although the application does not return the response body from the target service, its UI behavior differs depending on the network state of the destination. This creates a behavioral side-channel that enables internal service enumeration. This vulnerability is fixed in 0.24.0-rc.1.

CVSS Scores

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Meta Information

Published

2026-03-03

Last Modified

2026-03-05

Generated

2026-07-06

AI Q&A

2026-03-04

EPSS Evaluated

2026-07-05

NVD

CVE-2026-27600

EUVD

EUVD-2026-9335

Affected Vendors & Products

Vendor	Product	Version / Range
sysadminsmedia	homebox	to 0.23.1 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-918	The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Attack-Flow Graph

Executive Summary

The vulnerability exists in the HomeBox home inventory and organization system prior to version 0.24.0-rc.1. Authenticated users can specify arbitrary URLs for the application to send HTTP POST requests to without any validation or restriction on the host, IP address, or port. Although the application does not reveal the response body from these requests, the user interface behaves differently based on the network state of the destination. This difference in behavior creates a side-channel that allows attackers to enumerate internal services.

Impact Analysis

This vulnerability can allow an authenticated user to perform internal service enumeration by exploiting the behavioral side-channel created by the notifier functionality. This means an attacker could gain information about internal network services that are not normally exposed, potentially aiding further attacks or reconnaissance within the network.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

The vulnerability is fixed in HomeBox version 0.24.0-rc.1. Immediate mitigation involves upgrading the application to this version or later.

Since the issue arises from the notifier functionality allowing arbitrary URLs without validation, restricting or disabling this feature until the upgrade is applied can reduce risk.

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