CVE-2026-40196: HomeBox is a home inventory and organization system. Versions prior to 0.25.0 contain a vulnerability where the…
CVE-2026-40196 · Severity: high · CVSS 8.1 · Published 2026-04-17
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ID remained permanently assigned to a user after being invited to a group, even after their access to that group was revoked.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.
No. Junglewise Threat Intelligence has no report of CVE-2026-40196 being exploited in the wild.
How severe is CVE-2026-40196?
High severity, with a CVSS score of 8.1, published 17 April 2026.
Which products and versions are affected?
Sysadminsmedia HomeBox. The advisory does not name versions.
Is there a fix for CVE-2026-40196?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-40196?
Check whether you run Sysadminsmedia HomeBox. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.