sysadminsmedia Homebox up to 0.26.x Notifier /api/v1/notifiers/test ValidateNotifierURL server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in sysadminsmedia Homebox up to 0.26.x. Impacted is the function ValidateNotifierURL of the file /api/v1/notifiers/test of the component Notifier. This manipulation causes server-side request forgery. This vulnerability is handled as CVE-2026-116680. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in sysadminsmedia Homebox up to 0.26.x and classified as critical. Affected by this vulnerability is the function ValidateNotifierURL of the file /api/v1/notifiers/test of the component Notifier. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

HomeBox is a home inventory and organization system. Prior to version 0.27.0, Homebox validates generic notifier URLs with ValidateNotifierURL before creation, update, testing, and scheduled delivery, but shoutrrr sends the request through http.DefaultClient.Do without a CheckRedirect policy that revalidates each Location target. An authenticated collection member can configure a permitted notifier host that redirects to loopback, link-local, cloud metadata, or another blocked destination, causing the follow-up request to bypass the product's SSRF policy. The flaw is reachable through POST /api/v1/notifiers/test for immediate requests and through stored notifiers during scheduled maintenance delivery. This issue is fixed in version 0.27.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-116680 since 10/26/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 0.27.0 eliminates this vulnerability.

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Productinfo

Vendor

• sysadminsmedia

Name

• Homebox

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26

Website

• Product: https://github.com/sysadminsmedia/homebox/

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