sysadminsmedia Homebox up to 0.25.x Notifier notifier_url.go server-side request forgery

Summaryinfo

A vulnerability, which was classified as problematic, was found in sysadminsmedia Homebox up to 0.25.x. Affected by this issue is some unknown functionality of the file backend/internal/sys/validate/notifier_url.go of the component Notifier. Such manipulation leads to server-side request forgery. This vulnerability is referenced as CVE-2026-55473. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in sysadminsmedia Homebox up to 0.25.x and classified as problematic. Affected by this issue is some unknown functionality of the file backend/internal/sys/validate/notifier_url.go of the component Notifier. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

HomeBox is a home inventory and organization system. Prior to 0.26.0, the default-on BlockBogonNets and BlockCloudMetadata notifier SSRF protections in backend/internal/sys/validate/notifier_url.go do not inspect IPv4 destinations embedded in the NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48. An authenticated user can submit a generic:// notifier through POST /v1/notifiers or POST /v1/notifiers/test, and on a Homebox instance that egresses through NAT64/DNS64, the gateway can translate an accepted IPv6 destination to cloud metadata, localhost, or another internal IPv4 host. The notifier test path returns delivery result information, and Shoutrrr propagates the response, providing feedback that can disclose retrieved metadata such as temporary credentials. Without NAT64 egress, the crafted IPv6 destination is not routable, but the guard still incorrectly classifies it as safe. This issue is fixed in version 0.26.0.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55473 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available.

Upgrading to version 0.26.0 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

Website

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

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