sysadminsmedia homebox up to 0.24.x Web Interface incorrect ownership assignment

Summaryinfo

A vulnerability identified as critical has been detected in sysadminsmedia homebox up to 0.24.x. Affected is an unknown function of the component Web Interface. The manipulation leads to incorrect ownership assignment. This vulnerability is referenced as CVE-2026-40196. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in sysadminsmedia homebox up to 0.24.x and classified as critical. This issue affects some unknown functionality of the component Web Interface. The manipulation with an unknown input leads to a incorrect ownership assignment vulnerability. Using CWE to declare the problem leads to CWE-708. The product assigns an owner to a resource, but the owner is outside of the intended control sphere. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

HomeBox is a home inventory and organization system. Versions prior to 0.25.0 contain a vulnerability where the defaultGroup ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked. While the web interface correctly enforced the access revocation and prevented the user from viewing or modifying the group's contents, the API did not. Because the original group ID persisted as the user's defaultGroup, and this value was not properly validated when the X-Tenant header was omitted, the user could still perform full CRUD operations on the group's collections through the API, bypassing the intended access controls. This issue has been fixed in version 0.25.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-40196 since 04/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 0.25.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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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

Website

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

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